diff --git a/__pycache__/random.cpython-311.pyc b/__pycache__/random.cpython-311.pyc
deleted file mode 100644
index f218e7f..0000000
Binary files a/__pycache__/random.cpython-311.pyc and /dev/null differ
diff --git a/src/main/java/net/pixaurora/janerator/worldgen/GeneratorLookup.java b/src/main/java/net/pixaurora/janerator/worldgen/GeneratorLookup.java
index a96b011..6baf152 100644
--- a/src/main/java/net/pixaurora/janerator/worldgen/GeneratorLookup.java
+++ b/src/main/java/net/pixaurora/janerator/worldgen/GeneratorLookup.java
@@ -1,6 +1,10 @@
 package net.pixaurora.janerator.worldgen;
 
+import java.util.Collection;
 import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
 
 import net.minecraft.world.level.chunk.ChunkGenerator;
 import net.pixaurora.janerator.graphing.Coordinate;
@@ -9,7 +13,7 @@
 public class GeneratorLookup {
     private List<ChunkGenerator> generatorMap;
 
-    private List<PlacementSelection> selections;
+    private Map<ChunkGenerator, PlacementSelection> selections;
     private ChunkGenerator fallbackGenerator;
 
     public GeneratorLookup(
@@ -21,8 +25,8 @@ public GeneratorLookup(
             .stream()
             .distinct()
             .map(generator -> new PlacementSelection(generator, GraphingUtils.getIndices(this.generatorMap, generator)))
-            .toList();
-        this.fallbackGenerator = this.selections
+            .collect(Collectors.toMap(PlacementSelection::getUsedGenerator, Function.identity()));
+        this.fallbackGenerator = this.getAllSelections()
             .stream()
             .max((selection1, selection2) -> selection1.size() - selection2.size())
             .get().getUsedGenerator();
@@ -36,8 +40,16 @@ public ChunkGenerator getAt(Coordinate coordinate) {
         return this.generatorMap.get(coordinate.toListIndex());
     }
 
-    public List<PlacementSelection> getAllSelections() {
-        return this.selections;
+    public Collection<PlacementSelection> getAllSelections() {
+        return this.selections.values();
+    }
+
+    public PlacementSelection getSelection(ChunkGenerator generator) {
+        if (! this.selections.containsKey(generator)) {
+            throw new RuntimeException("No selection found associated with this generator.");
+        }
+
+        return this.selections.get(generator);
     }
 
     public ChunkGenerator getDefault() {
diff --git a/src/main/java/net/pixaurora/janerator/worldgen/PlacementSelection.java b/src/main/java/net/pixaurora/janerator/worldgen/PlacementSelection.java
index d8f2dfb..add0234 100644
--- a/src/main/java/net/pixaurora/janerator/worldgen/PlacementSelection.java
+++ b/src/main/java/net/pixaurora/janerator/worldgen/PlacementSelection.java
@@ -7,26 +7,27 @@
 
 public class PlacementSelection {
     private ChunkGenerator generator;
-    private List<Integer> placements;
+    private List<Coordinate> placements;
 
     public PlacementSelection(ChunkGenerator generator, List<Coordinate> placements) {
         this.generator = generator;
-        this.placements = placements
-            .stream()
-            .map(Coordinate::toListIndex)
-            .toList();
+        this.placements = placements;
     }
 
-    public boolean contains(int x, int z) {
-        return this.placements.contains(
-            new Coordinate(x, z).toListIndex()
-        );
+    public List<Coordinate> getPlacements() {
+        return this.placements;
     }
 
     public ChunkGenerator getUsedGenerator() {
         return this.generator;
     }
 
+    public boolean contains(int x, int z) {
+        return this.placements.contains(
+            new Coordinate(x, z)
+        );
+    }
+
     public int size() {
         return this.placements.size();
     }
diff --git a/src/main/java/net/pixaurora/janerator/worldgen/generator/MultiGenerator.java b/src/main/java/net/pixaurora/janerator/worldgen/generator/MultiGenerator.java
index ebffd80..0bbd4df 100644
--- a/src/main/java/net/pixaurora/janerator/worldgen/generator/MultiGenerator.java
+++ b/src/main/java/net/pixaurora/janerator/worldgen/generator/MultiGenerator.java
@@ -191,7 +191,9 @@ public CompletableFuture<ChunkAccess> createBiomes(
                 );
 
                 return chunk;
-            });
+            },
+            executor
+        );
 	}
 
 	@Override