diff --git a/Ruins/src/main/java/atomicstryker/ruins/common/FileHandler.java b/Ruins/src/main/java/atomicstryker/ruins/common/FileHandler.java
index f03bd7a34..21fd296fe 100644
--- a/Ruins/src/main/java/atomicstryker/ruins/common/FileHandler.java
+++ b/Ruins/src/main/java/atomicstryker/ruins/common/FileHandler.java
@@ -18,6 +18,7 @@
 import net.minecraft.block.Block;
 import net.minecraft.init.Blocks;
 import net.minecraft.util.ResourceLocation;
+import net.minecraft.world.DimensionType;
 import net.minecraft.world.biome.Biome;
 
 class FileHandler
@@ -234,7 +235,7 @@ private void recalcBiomeWeight(String biomeName)
         vars.put(biomeName, val);
     }
 
-    private static final Pattern patternSpecificBiome = Pattern.compile("\\s*+specific_([^\\s=]++)\\s*+=\\s*+([^\\s#]++)");
+    private static final Pattern patternSpecificBiome = Pattern.compile("specific_([^=]++)=(.++)");
 
     private void readPerWorldOptions(File dir, PrintWriter ruinsLog) throws Exception
     {
@@ -323,7 +324,7 @@ else if (check[0].equals("teblocks") && check.length > 1)
                     }
                 }
             }
-            else if ((matcher = patternSpecificBiome.matcher(read)).lookingAt())
+            else if ((matcher = patternSpecificBiome.matcher(read)).matches())
             {
                 boolean found = false;
                 Biome bgb;
@@ -359,6 +360,7 @@ private void addRuins(PrintWriter pw, File path, String name, HashSet<RuinTempla
         RuinTemplate r;
         Biome bgb;
         File[] listFiles = path.listFiles();
+        final String dimensionName = DimensionType.getById(dimension).getName();
         if (listFiles != null)
         {
             for (File f : listFiles)
@@ -366,6 +368,10 @@ private void addRuins(PrintWriter pw, File path, String name, HashSet<RuinTempla
                 try
                 {
                     r = new RuinTemplate(pw, f.getCanonicalPath(), f.getName());
+                    if (!r.acceptsDimension(dimensionName))
+                    {
+                        continue;
+                    }
                     targetList.add(r);
                     for (String biomeName : r.getBiomesToSpawnIn())
                     {
diff --git a/Ruins/src/main/java/atomicstryker/ruins/common/RuinTemplate.java b/Ruins/src/main/java/atomicstryker/ruins/common/RuinTemplate.java
index cff690a34..7fdaa8552 100644
--- a/Ruins/src/main/java/atomicstryker/ruins/common/RuinTemplate.java
+++ b/Ruins/src/main/java/atomicstryker/ruins/common/RuinTemplate.java
@@ -48,6 +48,7 @@ public class RuinTemplate
     private boolean preventRotation = false;
     private final ArrayList<Integer> bonemealMarkers;
     private final ArrayList<AdjoiningTemplateData> adjoiningTemplates;
+    private final Set<String> acceptedDimensions = new HashSet<>();
 
     private class AdjoiningTemplateData
     {
@@ -855,6 +856,14 @@ else if (line.startsWith("unacceptable_target_blocks"))
                         deniedSurfaces = inacceptables.toArray(deniedSurfaces);
                     }
                 }
+                else if (line.startsWith("dimensionsToSpawnIn"))
+                {
+                    String[] check = line.split("=");
+                    if (check.length > 1)
+                    {
+                        Collections.addAll(acceptedDimensions, check[1].split(","));
+                    }
+                }
                 else if (line.startsWith("dimensions"))
                 {
                     String[] check = line.split("=");
@@ -1131,6 +1140,11 @@ public Block getAirBlock()
         return Blocks.AIR;
     }
 
+    public boolean acceptsDimension(final String dimension)
+    {
+        return acceptedDimensions.isEmpty() || dimension != null && !dimension.isEmpty() && acceptedDimensions.contains(dimension);
+    }
+
     // A VariantRuleset is a list of template rules, some of which may have a number of variant versions from which the
     // actual rule definitions for a particular structure are randomly drawn. This allows per-structure randomization
     // (in addition to regular per-block randomization) without the need to create separate templates.
diff --git a/Ruins/src/main/java/atomicstryker/ruins/common/World2TemplateParser.java b/Ruins/src/main/java/atomicstryker/ruins/common/World2TemplateParser.java
index 08ab26b4a..5963d8d4f 100644
--- a/Ruins/src/main/java/atomicstryker/ruins/common/World2TemplateParser.java
+++ b/Ruins/src/main/java/atomicstryker/ruins/common/World2TemplateParser.java
@@ -472,6 +472,10 @@ private void toFile(File file)
             pw.println("# e.g., a weight=6 template is chosen 3X as often as one with weight=2");
             pw.println("weight=1");
             pw.println("#");
+            pw.println("# list of dimensions in which this template may spawn, even if generic");
+            pw.println("# one or more dimension names, separated by commas (blank = all)");
+            pw.println("dimensionsToSpawnIn=");
+            pw.println("#");
             pw.println("# list of other biomes in which this template may spawn");
             pw.println("# biome corresponding to directory is always assumed, listed or not");
             pw.println("# generic templates should leave this list empty");
diff --git a/Ruins/src/main/resources/changelog.txt b/Ruins/src/main/resources/changelog.txt
index ba4452d59..1bc21929f 100644
--- a/Ruins/src/main/resources/changelog.txt
+++ b/Ruins/src/main/resources/changelog.txt
@@ -545,3 +545,5 @@ a: setAccessible now true
 + consider dimension in "recursive generator" check, bugfix
 + allow floating point block and template weights, rule and specific_biome chance values
 + remove extra +1% generic spawn chance, bugfix
++ support biome names containing spaces
++ templates can now specify dimensions to spawn in
diff --git a/Ruins/src/main/resources/examplesAndDocs/template_rules.txt b/Ruins/src/main/resources/examplesAndDocs/template_rules.txt
index a22fd366a..e88e14cff 100644
--- a/Ruins/src/main/resources/examplesAndDocs/template_rules.txt
+++ b/Ruins/src/main/resources/examplesAndDocs/template_rules.txt
@@ -187,6 +187,12 @@
 # and is of lower precedence than + and -; parentheses may be used to further control the
 # order of evaluation.
 #
+# Ruins 17.3 adds optional variable "dimensionsToSpawnIn" to specify in which
+# dimensions the template's structures may appear. Note this applies to generic
+# spawning as well. List one or more dimensions by name, separated by commas,
+# or leave blank (default) to allow all dimensions.
+# example: dimensionsToSpawnIn=overworld,twilight_forest
+#
 
 weight=5
 embed_into_distance=1