Issue Description:

Server crash, hard to say specifically what it was caused by but from the crash log it seems connected to the death of an entity and collecting demon will.

What happens:

Class cast exception causes the server to crash
http://pastebin.com/fLnWWw06

What you expected to happen:

demon will to be collected correctly

Steps to reproduce:

Unkown other than to attempt to collect will
From the crash it appears to be trying to collect will from a fireball

Affected Versions (Do not use "latest"):

• BloodMagic: 2.1.6-75
• Minecraft: 1.11.2
• Forge: 13.20.0.2252

Can be replicated by hitting ghast's fireballs back at itself while using sentient sword, doesn't crash 100% of the time though.

Edit: Appears to only happen with a not full tartaric gem in inventory (or bad RNG in testing)