Minecraft - 1.7.10
--------Involved Mods------
Ender IO - 2.2.8.381
Sanguimancy - 1.1.9-29
Mekinism - 8.1.3.231
--------Crash Report-------
Pastebin - http://pastebin.com/menKawd7

I can't tell you what was going on before this crash happened as this is from one of the servers using the Resonant Rise pack. I am still trying to recreate this issue, just thought you might have some insight on this one.

Sanguimancy - Tombenpotter/Sanguimancy#61
Ender IO - SleepyTrousers/EnderIO-1.5-1.12#2543

Crash points to Sanguimancy as the culprit. Let me know what the author says.

Will Do