diff --git a/src/main/java/WayofTime/alchemicalWizardry/api/event/TeleposeEvent.java b/src/main/java/WayofTime/alchemicalWizardry/api/event/TeleposeEvent.java
new file mode 100644
index 00000000..fe4642f9
--- /dev/null
+++ b/src/main/java/WayofTime/alchemicalWizardry/api/event/TeleposeEvent.java
@@ -0,0 +1,47 @@
+package WayofTime.alchemicalWizardry.api.event;
+
+import cpw.mods.fml.common.eventhandler.Event;
+
+import net.minecraft.world.World;
+import net.minecraft.block.Block;
+
+/** Fired when a teleposer attempts to transpose two blocks. Use this to perform special cleanup or compensation,
+or cancel it entirely to prevent the transposition. */
+@Cancelable
+public class TeleposeEvent extends Event {
+  
+  public final World initialWorld;
+  public final int initialX;
+  public final int initialY;
+  public final int initialZ;
+  
+  public final Block initialBlock;
+  public final int initialMetadata;
+  
+  public final World finalWorld;
+  public final int finalX;
+  public final int finalY;
+  public final int finalZ;
+  
+  public final Block finalBlock;
+  public final int finalMetadata;
+  
+  public TeleposeEvent(World wi, int xi, int yi, int zi, Block bi, int mi, World wf, int xf, int yf, int zf, Block bf, int mf) {
+    initialWorld = wi;
+    initialX = xi;
+    initialY = yi;
+    initialZ = zi;
+    
+    initialBlock = bi;
+    initialMetadata = mi;
+    
+    finalWorld = wf;
+    finalX = xf;
+    finalY = yf;
+    finalZ = zf;
+    
+    finalBlock = bf;
+    finalMetadata = mf;
+  }
+
+}
diff --git a/src/main/java/WayofTime/alchemicalWizardry/common/block/BlockTeleposer.java b/src/main/java/WayofTime/alchemicalWizardry/common/block/BlockTeleposer.java
index 53fbc75f..a9362810 100644
--- a/src/main/java/WayofTime/alchemicalWizardry/common/block/BlockTeleposer.java
+++ b/src/main/java/WayofTime/alchemicalWizardry/common/block/BlockTeleposer.java
@@ -190,7 +190,9 @@ public class BlockTeleposer extends BlockContainer
         int metaI = worldI.getBlockMetadata(xi, yi, zi);
         int metaF = worldF.getBlockMetadata(xf, yf, zf);
         
-        //TODO Teleposer event
+        TeleposeEvent evt = new TeleposeEvent(worldI, xi, yi, zi, blockI, metaI, worldF, xf, yf, zf, blockF, metaF);
+        if (MinecraftForge.EVENT_BUS.post(evt))
+            return false;
         
         worldI.playSoundEffect(xi, yi, zi, "mob.endermen.portal", 1.0F, 1.0F);
         worldF.playSoundEffect(xf, yf, zf, "mob.endermen.portal", 1.0F, 1.0F);