diff --git a/build.gradle.kts b/build.gradle.kts
index 484bc0d60..75e5d180e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -55,7 +55,7 @@ dependencies {
 
     implementation("net.jafama:jafama:2.3.2")
 
-    implementation(name = "Tectonic-1.0.2", group = "")
+    implementation(name = "Tectonic-1.0.3", group = "")
 
 
     // JUnit.
diff --git a/lib/Tectonic-1.0.2.jar b/lib/Tectonic-1.0.3.jar
similarity index 84%
rename from lib/Tectonic-1.0.2.jar
rename to lib/Tectonic-1.0.3.jar
index f78f2ab6f..cd2e32320 100644
Binary files a/lib/Tectonic-1.0.2.jar and b/lib/Tectonic-1.0.3.jar differ
diff --git a/src/main/java/com/dfsek/terra/async/AsyncFeatureFinder.java b/src/main/java/com/dfsek/terra/async/AsyncFeatureFinder.java
index f6f755ecd..562382f7d 100644
--- a/src/main/java/com/dfsek/terra/async/AsyncFeatureFinder.java
+++ b/src/main/java/com/dfsek/terra/async/AsyncFeatureFinder.java
@@ -11,15 +11,15 @@ import org.jetbrains.annotations.NotNull;
 import java.util.function.Consumer;
 
 public abstract class AsyncFeatureFinder<T> implements Runnable {
-    private final TerraBiomeGrid grid;
-    private final T target;
-    private final int startRadius;
-    private final int maxRadius;
-    private final int centerX;
-    private final int centerZ;
-    private final World world;
+    protected final TerraBiomeGrid grid;
+    protected final T target;
+    protected final int startRadius;
+    protected final int maxRadius;
+    protected final int centerX;
+    protected final int centerZ;
+    protected final World world;
     private final Consumer<Vector> callback;
-    private int searchSize = 1;
+    protected int searchSize = 1;
 
     public AsyncFeatureFinder(TerraBiomeGrid grid, T target, @NotNull Location origin, int startRadius, int maxRadius, Consumer<Vector> callback) {
         this.grid = grid;
diff --git a/src/main/java/com/dfsek/terra/async/AsyncStructureFinder.java b/src/main/java/com/dfsek/terra/async/AsyncStructureFinder.java
index 59058cce0..bda8bf6c5 100644
--- a/src/main/java/com/dfsek/terra/async/AsyncStructureFinder.java
+++ b/src/main/java/com/dfsek/terra/async/AsyncStructureFinder.java
@@ -3,6 +3,7 @@ package com.dfsek.terra.async;
 import com.dfsek.terra.biome.UserDefinedBiome;
 import com.dfsek.terra.biome.grid.TerraBiomeGrid;
 import com.dfsek.terra.generation.items.TerraStructure;
+import com.dfsek.terra.procgen.GridSpawn;
 import com.dfsek.terra.structure.Rotation;
 import com.dfsek.terra.structure.Structure;
 import org.bukkit.Location;
@@ -33,12 +34,11 @@ public class AsyncStructureFinder extends AsyncFeatureFinder<TerraStructure> {
     public boolean isValid(int x, int z, TerraStructure target) {
         World world = getWorld();
         Location spawn = target.getSpawn().getChunkSpawn(x, z, world.getSeed()).toLocation(world);
-        if(!((UserDefinedBiome) getGrid().getBiome(spawn)).getConfig().getStructures().contains(target))
-            return false;
+        if(!((UserDefinedBiome) grid.getBiome(spawn)).getConfig().getStructures().contains(target)) return false;
         Random r2 = new FastRandom(spawn.hashCode());
         Structure struc = target.getStructures().get(r2);
         Rotation rotation = Rotation.fromDegrees(r2.nextInt(4) * 90);
-        for(int y = target.getSpawnStart().get(r2); y > 0; y--) {
+        for(int y = target.getSpawnStart().get(r2); y > target.getBound().getMin(); y--) {
             if(!target.getBound().isInRange(y)) return false;
             spawn.setY(y);
             if(!struc.checkSpawns(spawn, rotation)) continue;
@@ -49,6 +49,7 @@ public class AsyncStructureFinder extends AsyncFeatureFinder<TerraStructure> {
 
     @Override
     public Vector finalizeVector(Vector orig) {
-        return getTarget().getSpawn().getNearestSpawn(orig.getBlockX() * getSearchSize(), orig.getBlockZ() * getSearchSize(), getWorld().getSeed());
+        GridSpawn spawn = target.getSpawn();
+        return spawn.getChunkSpawn(orig.getBlockX(), orig.getBlockZ(), world.getSeed());
     }
 }
diff --git a/src/main/java/com/dfsek/terra/carving/UserDefinedCarver.java b/src/main/java/com/dfsek/terra/carving/UserDefinedCarver.java
index 5c8e8db84..4cc1659cd 100644
--- a/src/main/java/com/dfsek/terra/carving/UserDefinedCarver.java
+++ b/src/main/java/com/dfsek/terra/carving/UserDefinedCarver.java
@@ -77,16 +77,15 @@ public class UserDefinedCarver extends Carver {
         return new UserDefinedWorm(length.get(r) / 2, r, vector, topCut, bottomCut);
     }
 
-    public Variable getSeedVar() {
+    protected Variable getSeedVar() {
         return seedVar;
     }
 
-
-    public Variable getLengthVar() {
+    protected Variable getLengthVar() {
         return lengthVar;
     }
 
-    public Variable getPosition() {
+    protected Variable getPosition() {
         return position;
     }
 
@@ -106,7 +105,7 @@ public class UserDefinedCarver extends Carver {
             for(int z = chunkZ - carvingRadius; z <= chunkZ + carvingRadius; z++) {
                 cache.getPoints(x, z, this).forEach(point -> {
                     Vector origin = point.getOrigin();
-                    if(FastMath.floorDiv(origin.getBlockX(), 16) != chunkX && FastMath.floorDiv(origin.getBlockZ(), 16) != chunkZ)
+                    if(FastMath.floorDiv(origin.getBlockX(), 16) != chunkX && FastMath.floorDiv(origin.getBlockZ(), 16) != chunkZ) // We only want to carve this chunk.
                         return;
                     point.carve(chunkX, chunkZ, consumer);
                 });