Just a heads up to you all, using Melee Turtles for killing mobs WILL crash you if they hit a mob with one of most Infernal Modifiers (like Gravity, Darkness, Fiery, etc.). I've disabled Infernal modifiers on Endermen for now since that's what I'm using the Melee Turtle for, but I'll be reporting this bug to the mod authors and seeing if there will be a fix for 1.6.4 or if that will be in 1.7.2