I finished a new mob trap that features pistons crushing monsters until they are killed. Unlike my other trap, this one requires a bit of explanation. It is a fast killer and does not accidently destroy drops, I think the only downside is wading against the water current. Anyways, here are the instructions: 1. Wait for optimal number of mobs spawned. 2. Pull the to crush monsters.3. wait until the sounds stop, then raise the roof. Repeat steps 1-3. When collecting, first lower the roof, wait until all mobs are killed, then place water on the brick block in the chamber, water will flood the area, disabling most of the mob spawners leaving only the pigmen spawner, who are neutral. Collect your items, then wade back to the doors, after being in the safe area, remove the water and quickly close the doors. This trap also comes with a small drowning piston trap for legit players. I also included an updated trap on the surface on my world save. The updated trap is also avalible as an mcedit schematic.