On 13-
Guided by The Host Azog waits for the the rocky squid-thing to drop into range. The darkness deepens above him when two of those things spread their tentacles and drop like stones through the darkness. At the last second Azog swings at one of them with all of his force shearing tentacles away and burying his sword deep in its body. Blood sprays across the room running down the blade. The the thing drops to the ground- spasming dead weight dragging the half-orc's sword with it until he is able to wrench it free.
Damage: 16 I don't see any reason True Strike shouldn't confirm your crit for you.
In the second that his sword was lodged in the body of the first attacker another one drops. Fang leaps for it muzzle bared, but the dull red eyes are hidden by stony membrane and tentacles in darkness. Fang's jaws snap on thin air.
Concealment 20%: 08
Just as the second on is lashing out with it's tentacles toward the priest, Ordin steps forward slicing clean and true. The dwarf's katana passes fully through the rocky hide of the creature as soon as it makes the mistake of getting too close. The creature hovers for a second longer and before dropping to the stone floor writhing in a growing pool of blood.
Damage: 14 (not quite a crit)
Luger tunes out Jeva's screaming to the best of his ability and waits as spread tentacles and membrane drop toward him from above. (Your readied attack action kicks in now.)
Dimlez waits, prepared to spew poison, but his compatriot's blades are too fast. Cursing to himself, the alchemist reconsiders and saves his spell. (You all act on 13, but the other guys beat you within 13 (higher init bonuses). You can save the spell since technically it wouldn't have been cast until just now when you have no target in range.)
Luger's readied action is up now.