That's the crash report, it seems to be something with either CodeChickenLib or EnderIo?
Any help would be appreciated!
Your crashlog is caused by TinkersToolLeveling, it looks to be a zombie holding a bow, or you killed a zombie with said bow.
In reply to SensualBardNoises:
You should remove the problematics mods, which seems to be TinkersToolLeveling. If the crash doesn't not occurs anymore, try to re-add it. If the crash still occurs, read the new crash report, and do the same with EnderIO.