Ok, so one thing I'm considering is a "Slay Tentacle" spell that would let you kill tentacles instantly, at least weaker ones.  There would also be higher level versions of the spell that can kill stronger/multiple tentacles (of course, expect the monsters to have more tentacles to attack with!)  The basic version would be a level 1 sorcerer/wizard spell and kill 1 tentacle, however.<br/><br/>Also, while looking up information on spells, I realized that you actually can't cast anything with a somatic component at all while grappled, and anything without a somatic component takes a concentration check.  Since this game has such a reliance on grappling however, I think I'm going to revert that to say that any spell can be cast while grappled, even if it has a somatic component, and those without a somatic component don't require a concentration check.