A question, however, regarding the wording of Summoner's Poison: Is it supposed to be overcomable by magic, or not? It says it can, but then the wording shifts as if it's not... I am confuzzled.
Whoops, adjusted.

So are you saying that it can't use its stinger without grappling with the foe first? If so, why is the stinger listed as the primary attack?
At risk of losing the feel of the thing with OOCness, basically so it has a better chance of hitting with the stinger. The legs have six chances to hit, the stinger has one.

You should already be afraid of Inevitables, judging from what I read about them in the SRD. They're like what Miko would be if she was a super-powerful near-invincible robot thing.
Just about ::)