File:LavaBlades.jpg

Summary
A 3-tier lava blade trap. Water sweeps mobs into the lava blocks, which are held in place by signs on each side and below. The signs act as blocks to prevent the lava from flowing, but still allow mobs (and you) to pass through. The top blade is intended to kill iron golems, the middle blade will kill skeletons and zombies, and the bottom single block will kill spiders. Baby zombies can still pass through this.