An Idea that I've had is to use TT to push him around a little
So get the kinetic attractor (whichever one is the mob one). Design your spawning section slightly back from the drop tube (L shaped)
Place a repulsion kinetic attractor next to the AA's, and an attracting one at the bottom of your tube, that should be enough to push him away from the spawning area and then lock it down the bottom of the tube. So using this method you could use spikes even to kill the wither.[DOUBLEPOST=1400369629][/DOUBLEPOST]Now to figure out a way to adapt this to AgS >(