Hello, I'm kind of new to FTB. I only started playing it a few days ago. I've set my goal to making a portal gun, but as you probably know it needs a wither star. I've got a Vorpal sword, but I'm not having the best of luck killing the occasional wither skeleton in a nether fortress. Does anyone have an effective design on a farm or something? I tried a soul cage with normal skeletons in the nether but it doesn't seem to spawn wither skeletons, only normal ones. I've been thinking of trying to find an actual spawner and moving it to the nether with my gravity gun but I'm afraid it do the same thing Thanks in advance.