something like this, the skele's go down the water and and it is straight no turns, big enough for them so the go to the corner of the 2 glass's on second floor, the lava burns and kills them and the arrows drop down into the water which flow into me.
i went afk for 1 hour and got 5 stacks of arrows this way.
I built one of these about 5 or 6 blocks up from bedrock and I haven't trapped a single monster.
Not a single enemy has spawned in my room on any of the difficulties. No torches in the room at all. As soon as I go topside, enemies spawn left and right... but NOTHING underground.
What am I doing wrong? I can make a video showing my room/build if that helps.
I have the exact same grinder setup built on the surface and it works flawlessly. Thought I'd try the same one built underground so that I could farm baddies faster but no luck!
Sorry to bump an old thread, but this was the thread I got your instructional image from..
I made a variation of the trap seen in this video:
I made a few adaptations. Here you can see a bird's eye view that shows the cacti that keep the spiders out since the trap does not work against them. In the top down view you can also see the elevated walkway that I use to draw more mobs in by walking out among them who are on the ground (but I am safe on the elevated walkway) and then walking back toward the trap.
Here you can see how I made a way into the thing from my base below. I climb up the ladder to reach the trap.
Here you can see that instead of having a collection point I have a drain that brings the loot into my home via my water feature. You can also see the ladder up into the trap behind it.
Here you can see the drain, and if you look close, the chests below, in the room down there.
There seems to be a critical threshold for the size of the dark room. Too small and mobs will spawn rarely, or not at all. It also seems that they need to be taller that NxNx2, though I can't verify that. I hacked in a 25x25x1 square of tnt at roughly bedrock level and detonated it from the surface. I got LOTS of mob spawns in there, but the 100x100x2 room I constructed at surface level never spawned even one mob.
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