A fix for SMN MP problems

[Tex_Mex]

Add a mp steal effect to fester ta-da!

60%-70% mp stolen per damage done wouldn't be an obscene amount and would not buff scholars.

I'm not sure that this is a great idea, since it pretty much removes the need for a SMN to ever cast energy drain. I would prefer something like:

Using fester grants a 50% chance to make the next energy drain cost no aetherflow.

This does a few things:
1) Grants the SMN some additional MP to help solve their MP starvation issues
2) Grants the SMN a very minor single target dps buff (which they need anyways)
3) Does not destroy energy drain
4) Keeps the buffs out of SCH hands. SCH does not need a buff at this time.