Ok, thinking about it a bit - I want to be able to throw out monsters that have fewer tentacels, but take more effort to kill them.  So I think I'll give tentacles their own hit dice, and limit the level 1 spell to only killing 1 HD worth of tentacles.  Higher level versions of the spell can either kill stronger tentacles, or kill multiple tentacles, at the caster's choice.<br/><br/>Also, waiting on Snake to see what Lyra does, since it looks like no one wants to free her... >.>