Is that it for the Will-bolt then, can we move on to SLAs?
I do believe so.
I'm not comfortable with Wisdom-based. SLAs are always Cha-based.
I'd be fine with an additional temporary modifier based on the amount of Wisdom drained. Something similar to the temporary hp usually granted by ability drain.
Since it's a template, I'd rather set the caster level equal to HD than locking it in.
Updated.
Did we ever decide upon these amounts?
Abilities: Increase from the base creature as follows: Int +x, Wis +x, Cha +x.