Parry! Joust! Riposte! Strike! Broccoli Sandwhich! (What?)

So you noticed...

...with your spot check that the tentacles are excreting a gritty slime - an injury poison to be precise.

Confused about initiative

I'm a bit confused, I had thought it was Castilel at 21 in the initiative count, the sewer aberration at 13, and Kaspar at 8? This would mean that the aberration comes swimming in, but Kaspar made the spot check, so no surprise. Initiative gets rolled, Castille goes first, decides to look about since he isn't threatened at the moment, and finds the hidden door. The aberration then completes a mvoe action, and lashes out with one tentacle. It missed. Kaspar then slashed with his rapier, rolling a 4 and missing, and as a move-equiv action he threw a stone to the side, which didn't fool the creature, but did establish that the thing has tremorsense.

Now we start the next combat round. You posted Kaspar's action then Castille's. Shouldn't it be Castille, aberration, then Kaspar? I might have missed something or not made something clear, or maybe just for the sake of economy you're telling me what you would do.

Whatever, I'll just assume that Castille goes first, then the aberration, then Kaspar, and you posted Kaspar to speed things along. If I made a mistake we'll just rewind and play again, it isn't something that we can't work around.

Anyway...

So you didn't get the Knowledge Dungeoneering check. Oh well.

Results of Castille's Action

So Castille isn't moving, just loading and firing the crossbow? Smart. The body of the thing is AC 13 (+1 natural, +1 dex, +1 size). 7 points of damage hurts it badly.

The Aberration's Action

It smarts, but it can take a licking and keep on ticking. For a little longer anyway. It lashes all three tentacles at Kaspar. (With the multiattack feat, that's a +1, +1, -2.) The first one...misses. The second one...hits. You take 2 h.p. bludgeoning damage and you have to make a Fortitude Save DC 12. (And another one in a few minutes.) The third one...misses.

Kaspar's Action

"Kaspar continues to run away from Castille."

Okay, that draws an attack of opportunity then. The tentacle...misses. Then a Sense Motive against your action (no need for you to roll a bluff check, I'm counting the sensory data of Kaspar running as a base DC of 15, made to 13 because of his low Cha.) And I rolled...a 1! (So much for online dice rollers, most of my rolls are single digits. Time to go back to the 'lucky d20.) Well, this thing has near-animal intelligence anyway.

An attack roll of 14. Well, if it's body is size small and that's 13, then the tentacles which are one size lower will have an AC of 14. So you hit. Damage 9 is reduced to 5, but the tentacle gets lopped off and splashes into the water. The thing burbles angrily. (Hey, let's say that you got the tentacle that hit you!) The aberration cannot make 3 attacks per round anymore.

Next Round

Now figure out Castille's action and roll. I'm making a morale check anyway for this creature, so if Castille does it even more damage I'll up the morale check DC.

If I screwed up on the initative thing, pop me an email and we'll sort this out.