How does one make an efficient kill room in Minecraft, that can survive creeper explosions?
So, I contained the spawner; I can probably augment it with some spawn rooms that will transport the mobs to the shafts dropping them the needed 22 blocks down to what is to be the room where I kill them. Then I'll have a creeper blow up and set all consecutive survivors free.
I know the walls must be built from obsidian, but how do I make the gap in it to swing my sword through? The text tutorials are rather sketchy, and the video tutorials use either fenceposts (which are definitely not blast proof) or some kind of transparent grid which I failed to identify (a different tileset, maybe?).
Best Answer
If a creeper is standing in water, then the blast damage is restricted to the water. So you can have water for the mobs to stand in, and if one accidentally blows up then you're not totally screwed with a broken trap, but it will kill the other mobs in the trap.
This is mine: