diff --git a/index.css b/index.css
index f070c939..1b7a983b 100644
--- a/index.css
+++ b/index.css
@@ -922,7 +922,7 @@ fieldset {
   display: inline-block;
 }
 
-body button.noicon {
+#templateTools > button {
   width: 1.8em;
   height: 1.6em;
   margin: 1px;
diff --git a/index.html b/index.html
index 214bfa9e..32c30825 100644
--- a/index.html
+++ b/index.html
@@ -1292,7 +1292,7 @@
                     <option value="volcano">Volcano</option>
                     <option value="highIsland">High Island</option>
                     <option value="lowIsland">Low Island</option>
-                    <option value="continents">Two Continents</option>
+                    <option value="continents">Continents</option>
                     <option value="archipelago">Archipelago</option>
                     <option value="atoll">Atoll</option>
                     <option value="mediterranean">Mediterranean</option>
@@ -1302,6 +1302,7 @@
                     <option value="shattered">Shattered</option>
                     <option value="taklamakan">Taklamakan</option>
                     <option value="oldWorld">Old World</option>
+                    <option value="fractious">Fractious</option>
                   </optgroup>
                   <optgroup label="Specific">
                     <option value="africa-centric">Africa Centric</option>
@@ -2932,13 +2933,13 @@
 
       <div id="templateEditor" class="dialog stable" style="display: none">
         <div id="templateTop">
-          <i>Select template: </i
-          ><select id="templateSelect" style="width: 16em" data-prev="templateCustom" data-tip="Select base template">
+          <i>Select template: </i>
+          <select id="templateSelect" style="width: 16em" data-prev="templateCustom" data-tip="Select base template">
             <option value="custom" selected>Custom</option>
             <option value="volcano">Volcano</option>
             <option value="highIsland">High Island</option>
             <option value="lowIsland">Low Island</option>
-            <option value="continents">Two Continents</option>
+            <option value="continents">Continents</option>
             <option value="archipelago">Archipelago</option>
             <option value="atoll">Atoll</option>
             <option value="mediterranean">Mediterranean</option>
@@ -2948,18 +2949,19 @@
             <option value="shattered">Shattered</option>
             <option value="taklamakan">Taklamakan</option>
             <option value="oldWorld">Old World</option>
+            <option value="fractious">Fractious</option>
           </select>
         </div>
         <div id="templateTools">
-          <button data-type="Hill" data-tip="Hill: small blob" class="noicon">H</button>
-          <button data-type="Pit" data-tip="Pit: round depression" class="noicon">P</button>
-          <button data-type="Range" data-tip="Range: elongated elevation" class="noicon">R</button>
-          <button data-type="Trough" data-tip="Trough: elongated depression" class="noicon">T</button>
-          <button data-type="Strait" data-tip="Strait: centered vertical or horizontal depression" class="noicon">S</button>
-          <button data-type="Insulate" data-tip="Insulate: lower cells near edges" class="noicon">I</button>
-          <button data-type="Add" data-tip="Add or subtract value from all heights in range" class="noicon">+</button>
-          <button data-type="Multiply" data-tip="Multiply all heights in range by factor" class="noicon">*</button>
-          <button data-type="Smooth" data-tip="Smooth the map replacing cell heights by an average values of its neighbors" class="noicon">~</button>
+          <button data-type="Hill" data-tip="Hill: small blob">H</button>
+          <button data-type="Pit" data-tip="Pit: round depression">P</button>
+          <button data-type="Range" data-tip="Range: elongated elevation">R</button>
+          <button data-type="Trough" data-tip="Trough: elongated depression">T</button>
+          <button data-type="Strait" data-tip="Strait: centered vertical or horizontal depression">S</button>
+          <button data-type="Mask" data-tip="Mask: lower cells near edges or in map center">M</button>
+          <button data-type="Add" data-tip="Add or subtract value from all heights in range">+</button>
+          <button data-type="Multiply" data-tip="Multiply all heights in range by factor">*</button>
+          <button data-type="Smooth" data-tip="Smooth the map replacing cell heights by an average values of its neighbors">~</button>
         </div>
         <div id="templateBody" data-changed="0" class="table" style="padding: 2px 0">
           <div data-type="Hill">
@@ -2986,6 +2988,9 @@
             onclick="openURL('https://cartographyassets.com/asset-category/specific-assets/azgaars-generator/templates')"
           ></button>
           <button id="templateTutorial" data-tip="Open Template Editor Tutorial" class="icon-info" onclick="wiki('Heightmap-template-editor')"></button>
+          <label data-tip="Set seed if you want template to generate the same heightmap each time. Leave blank to use random seed">
+            Seed: <input id="templateSeed" value="" type="number" min="1" max="999999999" step="1" />
+          </label>
         </div>
       </div>
 
@@ -6110,7 +6115,7 @@
     <script src="utils/unitUtils.js"></script>
 
     <script src="modules/voronoi.js"></script>
-    <script src="modules/heightmap-templates.js"></script>
+    <script src="modules/heightmap-templates.js?v=21052020"></script>
     <script src="modules/heightmap-generator.js?v=21052020"></script>
     <script src="modules/ocean-layers.js"></script>
     <script src="modules/river-generator.js"></script>
diff --git a/modules/heightmap-generator.js b/modules/heightmap-generator.js
index 0f77e770..80eecde1 100644
--- a/modules/heightmap-generator.js
+++ b/modules/heightmap-generator.js
@@ -61,7 +61,7 @@ window.HeightmapGenerator = (function () {
     if (a1 === "Range") return addRange(a2, a3, a4, a5);
     if (a1 === "Trough") return addTrough(a2, a3, a4, a5);
     if (a1 === "Strait") return addStrait(a2, a3);
-    if (a1 === "Insulate") return insulate(a2);
+    if (a1 === "Mask") return mask(a2);
     if (a1 === "Add") return modify(a3, +a2, 1);
     if (a1 === "Multiply") return modify(a3, 0, +a2);
     if (a1 === "Smooth") return smooth(a2);
@@ -432,14 +432,17 @@ window.HeightmapGenerator = (function () {
     });
   };
 
-  const insulate = (fr = 2) => {
-    const power = fr * 2;
+  const mask = (power = 1) => {
+    const fr = power ? Math.abs(power) : 1;
+
     cells.h = cells.h.map((h, i) => {
       const [x, y] = p[i];
-      const nx = (2 * x) / graphWidth - 1;
-      const ny = (2 * y) / graphHeight - 1;
-      const distance = (1 - nx ** power) * (1 - ny ** power); // 1 is center, 0 is edge
-      return h * distance;
+      const nx = (2 * x) / graphWidth - 1; // [-1, 1], 0 is center
+      const ny = (2 * y) / graphHeight - 1; // [-1, 1], 0 is center
+      let distance = (1 - nx ** 2) * (1 - ny ** 2); // 1 is center, 0 is edge
+      if (power < 0) distance = 1 - distance; // inverted, 0 is center, 1 is edge
+      const masked = h * distance;
+      return lim((h * (fr - 1) + masked) / fr);
     });
   };
 
@@ -462,5 +465,5 @@ window.HeightmapGenerator = (function () {
     }
   }
 
-  return {generate, addHill, addRange, addTrough, addStrait, addPit, smooth, modify, insulate};
+  return {generate, addHill, addRange, addTrough, addStrait, addPit, smooth, modify, mask};
 })();
diff --git a/modules/heightmap-templates.js b/modules/heightmap-templates.js
index 0266ce39..baff264c 100644
--- a/modules/heightmap-templates.js
+++ b/modules/heightmap-templates.js
@@ -4,49 +4,55 @@ window.HeightmapTemplates = (function () {
   const volcano = `Hill 1 90-100 44-56 40-60
     Multiply 0.8 50-100 0 0
     Range 1.5 30-55 45-55 40-60
-    Smooth 2 0 0 0
-    Hill 1.5 25-35 25-30 20-75
-    Hill 1 25-35 75-80 25-75
-    Hill 0.5 20-25 10-15 20-25`;
+    Smooth 3 0 0 0
+    Hill 1.5 35-45 25-30 20-75
+    Hill 1 35-55 75-80 25-75
+    Hill 0.5 20-25 10-15 20-25
+    Mask 3 0 0 0`;
 
   const highIsland = `Hill 1 90-100 65-75 47-53
-    Add 5 all 0 0
-    Hill 6 20-23 25-55 45-55
+    Add 7 all 0 0
+    Hill 5-6 20-30 25-55 45-55
     Range 1 40-50 45-55 45-55
+    Multiply 0.8 land 0 0
+    Mask 3 0 0 0
     Smooth 2 0 0 0
     Trough 2-3 20-30 20-30 20-30
     Trough 2-3 20-30 60-80 70-80
     Hill 1 10-15 60-60 50-50
     Hill 1.5 13-16 15-20 20-75
-    Multiply 0.8 20-100 0 0
     Range 1.5 30-40 15-85 30-40
     Range 1.5 30-40 15-85 60-70
-    Pit 2-3 10-15 15-85 20-80`;
+    Pit 3-5 10-30 15-85 20-80`;
 
   const lowIsland = `Hill 1 90-99 60-80 45-55
-    Hill 4-5 25-35 20-65 40-60
+    Hill 1-2 20-30 10-30 10-90
+    Smooth 2 0 0 0
+    Hill 6-7 25-35 20-70 30-70
     Range 1 40-50 45-55 45-55
-    Smooth 3 0 0 0
-    Trough 1.5 20-30 15-85 20-30
-    Trough 1.5 20-30 15-85 70-80
+    Trough 2-3 20-30 15-85 20-30
+    Trough 2-3 20-30 15-85 70-80
     Hill 1.5 10-15 5-15 20-80
     Hill 1 10-15 85-95 70-80
-    Pit 3-5 10-15 15-85 20-80
-    Multiply 0.4 20-100 0 0`;
+    Pit 5-7 15-25 15-85 20-80
+    Multiply 0.4 20-100 0 0
+    Mask 4 0 0 0`;
 
-  const continents = `Hill 1 80-85 75-80 40-60
-    Hill 1 80-85 20-25 40-60
-    Multiply 0.22 20-100 0 0
-    Hill 5-6 15-20 25-75 20-82
-    Range .8 30-60 5-15 20-45
-    Range .8 30-60 5-15 55-80
+  const continents = `Hill 1 80-85 60-80 40-60
+    Hill 1 80-85 20-30 40-60
+    Hill 6-7 15-30 25-75 15-85
+    Multiply 0.6 land 0 0
+    Hill 8-10 5-10 15-85 20-80
+    Range 1-2 30-60 5-15 25-75
+    Range 1-2 30-60 80-95 25-75
     Range 0-3 30-60 80-90 20-80
-    Trough 3-4 15-20 15-85 20-80
     Strait 2 vertical 0 0
-    Smooth 2 0 0 0
-    Trough 1-2 5-10 45-55 45-55
-    Pit 3-4 10-15 15-85 20-80
-    Hill 1 5-10 40-60 40-60`;
+    Strait 1 vertical 0 0
+    Smooth 3 0 0 0
+    Trough 3-4 15-20 15-85 20-80
+    Trough 3-4 5-10 45-55 45-55
+    Pit 3-4 10-20 15-85 20-80
+    Mask 4 0 0 0`;
 
   const archipelago = `Add 11 all 0 0
     Range 2-3 40-60 20-80 20-80
@@ -65,16 +71,17 @@ window.HeightmapTemplates = (function () {
     Multiply 0.2 25-100 0 0
     Hill .5 10-20 50-55 48-52`;
 
-  const mediterranean = `Range 3-4 30-50 0-100 0-10
-    Range 3-4 30-50 0-100 90-100
-    Hill 5-6 30-70 0-100 0-5
-    Hill 5-6 30-70 0-100 95-100
+  const mediterranean = `Range 4-6 30-80 0-100 0-10
+    Range 4-6 30-80 0-100 90-100
+    Hill 6-8 30-50 10-90 0-5
+    Hill 6-8 30-50 10-90 95-100
+    Multiply 0.9 land 0 0
+    Mask -2 0 0 0
     Smooth 1 0 0 0
     Hill 2-3 30-70 0-5 20-80
     Hill 2-3 30-70 95-100 20-80
-    Multiply 0.8 land 0 0
-    Trough 3-5 40-50 0-100 0-10
-    Trough 3-5 40-50 0-100 90-100`;
+    Trough 3-6 40-50 0-100 0-10
+    Trough 3-6 40-50 0-100 90-100`;
 
   const peninsula = `Range 2-3 20-35 40-50 0-15
     Add 5 all 0 0
@@ -117,57 +124,26 @@ window.HeightmapTemplates = (function () {
     Hill 2-4 60-85 0-5 0-100
     Hill 2-4 60-85 95-100 0-100
     Hill 3-4 60-85 20-80 0-5
-    Hill 3-4 60-85 20-80 95-100`;
+    Hill 3-4 60-85 20-80 95-100
+    Smooth 3 0 0 0`;
 
-  const oldWorld = `Hill 4-6 20-40 15-85 30-45
-    Hill 3-7 20-40 15-85 55-70
-    Strait 2-7 vertical 0 0
-    Pit 1-2 40-50 35-55 20-80
-    Strait 2-7 vertical 0 0
-    Range 2-3 20-25 15-35 20-30
-    Range 2-3 20-25 15-35 65-80
-    Range 2-3 20-25 45-85 20-45
-    Range 2-3 20-25 45-85 65-80
-    Multiply .9 80-100 0 0
-    Strait 2-7 vertical 0 0
-    Pit 2-3 40-50 45-65 20-80
-    Trough 1-2 40-50 15-45 20-45
-    Trough 1-3 40-50 15-45 45-80
-    Trough 1-2 40-50 45-85 20-45
-    Trough 1-2 40-50 45-85 45-80
-    Multiply 1.2 17-20 0 0
-    Strait 2-7 horizontal 0 0
-    Multiply 1.2 17-50 0 0
-    Range 1-2 20-25 15-45 45-65
-    Range 1-2 20-25 65-85 45-80
-    Multiply 1.1 50-80 0 0
-    Hill 1-2 20 15-45 20-80
-    Hill 1-2 20 65-85 20-80
-    Multiply 1.2 15-30 0 0
-    Strait 2-7 vertical 0 0
-    Trough 1-2 40-50 35-65 65-80
-    Range 1-2 20-25 15-35 20-45
-    Strait 2-7 vertical 0 0
-    Range 1-2 20-25 65-85 45-80
-    Multiply .9 70-100 0 0
-    Hill 1-2 20-25 15-45 65-80
-    Hill 1-2 20-25 65-85 20-45
-    Hill 1 20-25 15-45 45-65
-    Hill 1 20-25 65-85 45-65
-    Strait 2-7 vertical 0 0
-    Trough 1-2 20-50 15-45 45-65
-    Trough 1-2 20-50 65-85 45-65
-    Strait 2-7 horizontal 0 0
-    Multiply 0.8 70-100 0 0
-    Hill 1-2 20-25 35-45 45-65
-    Hill 1-2 20-25 65-70 45-65
-    Pit 2-3 40-50 45-65 30-70
-    Trough 1-2 40-50 15-85 65-80
-    Trough 1-2 40-50 15-85 10-35
-    Strait 2-5 vertical 0 0
-    Multiply 1.1 45-90 0 0
+  const oldWorld = `Range 3 70 15-85 20-80
+    Hill 2-3 50-70 15-45 20-80
+    Hill 2-3 50-70 65-85 20-80
+    Hill 4-6 20-25 15-85 20-80
+    Multiply 0.5 land 0 0
+    Smooth 2 0 0 0
+    Range 3-4 20-50 15-35 20-45
+    Range 2-4 20-50 65-85 45-80
     Strait 3-7 vertical 0 0
-    Trough 1-2 40-50 45-65 45-65`;
+    Trough 6-8 20-50 15-85 45-65
+    Pit 5-6 20-30 10-90 10-90`;
+
+  const fractious = `Hill 12-15 50-80 5-95 5-95
+    Mask -1.5 0 0 0
+    Mask 3 0 0 0
+    Add -20 30-100 0 0
+    Range 6-8 40-50 5-95 10-90`;
 
   return {
     volcano,
@@ -183,6 +159,7 @@ window.HeightmapTemplates = (function () {
     isthmus,
     shattered,
     taklamakan,
-    oldWorld
+    oldWorld,
+    fractious
   };
 })();
diff --git a/modules/ui/heightmap-editor.js b/modules/ui/heightmap-editor.js
index 8e11965b..14963745 100644
--- a/modules/ui/heightmap-editor.js
+++ b/modules/ui/heightmap-editor.js
@@ -487,8 +487,8 @@ function editHeightmap() {
 
   function updateStatistics() {
     const landCells = grid.cells.h.reduce((s, h) => (h >= 20 ? s + 1 : s));
-    landmassCounter.innerHTML = /* html */ `${landCells} (${rn((landCells / grid.cells.i.length) * 100)}%)`;
-    landmassAverage.innerHTML = rn(d3.mean(grid.cells.h));
+    byId("landmassCounter").innerText = `${landCells} (${rn((landCells / grid.cells.i.length) * 100)}%)`;
+    byId("landmassAverage").innerText = rn(d3.mean(grid.cells.h));
   }
 
   function updateHistory(noStat) {
@@ -691,7 +691,7 @@ function editHeightmap() {
 
   function openTemplateEditor() {
     if ($("#templateEditor").is(":visible")) return;
-    const body = byId("templateBody");
+    const $body = byId("templateBody");
 
     $("#templateEditor").dialog({
       title: "Template Editor",
@@ -707,13 +707,13 @@ function editHeightmap() {
     $("#templateBody").sortable({items: "> div", handle: ".icon-resize-vertical", containment: "#templateBody", axis: "y"});
 
     // add listeners
-    body.on("click", function (ev) {
+    $body.on("click", function (ev) {
       const el = ev.target;
       if (el.classList.contains("icon-check")) {
         el.classList.remove("icon-check");
         el.classList.add("icon-check-empty");
         el.parentElement.style.opacity = 0.5;
-        body.dataset.changed = 1;
+        $body.dataset.changed = 1;
         return;
       }
       if (el.classList.contains("icon-check-empty")) {
@@ -728,6 +728,13 @@ function editHeightmap() {
       }
     });
 
+    byId("templateEditor").on("keypress", event => {
+      if (event.key === "Enter") {
+        event.preventDefault();
+        executeTemplate();
+      }
+    });
+
     byId("templateTools").on("click", addStepOnClick);
     byId("templateSelect").on("change", selectTemplate);
     byId("templateRun").on("click", executeTemplate);
@@ -789,9 +796,10 @@ function editHeightmap() {
           </select></span>
           <span>w:<input class="templateCount" data-tip="Strait width, use hyphen to get a random number in range" value=${count || "2-7"}></span></div>`;
 
-      if (type === "Insulate")
-        return /* html */ `${common}<span>f:<input class="templateCount" data-tip="Set insulation power. 1 - full insulation, 2 - half-insulation, etc." type="number" min=1 max=10
-          value=${count || 2}></span></div>`;
+      if (type === "Mask")
+        return /* html */ `${common}<span>f:<input class="templateCount"
+          data-tip="Set masking fraction. 1 - full insulation (prevent land on map edges), 2 - half-insulation, etc. Negative number to inverse the effect"
+          type="number" min=-10 max=10 value=${count || 1}></span></div>`;
 
       if (type === "Add")
         return /* html */ `${common}<span>to:<select class="templateDist" data-tip="Change only land or all cells">
@@ -811,8 +819,8 @@ function editHeightmap() {
           value=${count || 1.1} min=0 max=10 step=.1></span></div>`;
 
       if (type === "Smooth")
-        return /* html */ `${common}<span>f:<input class="templateCount" data-tip="Set smooth fraction. 1 - full smooth, 2 - half-smooth, etc." type="number" min=1 max=10
-          value=${count || 2}></span></div>`;
+        return /* html */ `${common}<span>f:<input class="templateCount" data-tip="Set smooth fraction. 1 - full smooth, 2 - half-smooth, etc."
+          type="number" min=1 max=10 step=1 value=${count || 2}></span></div>`;
     }
 
     function setRange(event) {
@@ -870,34 +878,36 @@ function editHeightmap() {
     }
 
     function executeTemplate() {
-      const body = byId("templateBody");
-      const steps = body.querySelectorAll("#templateBody > div");
+      const steps = byId("templateBody").querySelectorAll("#templateBody > div");
       if (!steps.length) return;
 
-      const {addHill, addPit, addRange, addTrough, addStrait, modify, smooth, insulate} = HeightmapGenerator;
       grid.cells.h = new Uint8Array(grid.cells.i.length); // clean all heights
 
+      const seed = byId("templateSeed").value;
+      if (seed) Math.random = aleaPRNG(seed);
+      restartHistory();
+
       for (const step of steps) {
         if (step.style.opacity === "0.5") continue;
-        const type = step.dataset.type;
 
         const count = step.querySelector(".templateCount")?.value || "";
         const height = step.querySelector(".templateHeight")?.value || "";
         const dist = step.querySelector(".templateDist")?.value || null;
         const x = step.querySelector(".templateX")?.value || null;
         const y = step.querySelector(".templateY")?.value || null;
+        const type = step.dataset.type;
 
-        if (type === "Hill") addHill(count, height, x, y);
-        else if (type === "Pit") addPit(count, height, x, y);
-        else if (type === "Range") addRange(count, height, x, y);
-        else if (type === "Trough") addTrough(count, height, x, y);
-        else if (type === "Strait") addStrait(count, dist);
-        else if (type === "Insulate") insulate(+count);
-        else if (type === "Add") modify(dist, +count, 1);
-        else if (type === "Multiply") modify(dist, 0, +count);
-        else if (type === "Smooth") smooth(+count);
+        if (type === "Hill") HeightmapGenerator.addHill(count, height, x, y);
+        else if (type === "Pit") HeightmapGenerator.addPit(count, height, x, y);
+        else if (type === "Range") HeightmapGenerator.addRange(count, height, x, y);
+        else if (type === "Trough") HeightmapGenerator.addTrough(count, height, x, y);
+        else if (type === "Strait") HeightmapGenerator.addStrait(count, dist);
+        else if (type === "Mask") HeightmapGenerator.mask(+count);
+        else if (type === "Add") HeightmapGenerator.modify(dist, +count, 1);
+        else if (type === "Multiply") HeightmapGenerator.modify(dist, 0, +count);
+        else if (type === "Smooth") HeightmapGenerator.smooth(+count);
 
-        updateHistory("noStat"); // update history every step
+        updateHistory("noStat"); // update history on every step
       }
 
       updateStatistics();