((Dragon Turtles have Blind Fight too?! Holy crap, that really WAS the perfect thing to polymorph into for this battle. Also, for some reason I didn't even imagine the Dragon Turtle being a robot as well. That's a badass image, and it makes way more sense than him turning into a fleshy one. Since it also makes sense that Jack would still be able to talk if he's still a robot, feel free to add in mid-combat banter for him.
Val Percentages (0-50 misses, 51-100 hits): First Attack 31; second attack misses; third attack misses.
Jack Percentage: first try 45%; reroll 30%. I got lucky here.
Tarkus hit the Fiendish Crocodile.
Everyone, when you attack Evaneth go ahead and roll the percentage die yourself, so that way everyone knows when you actually hit.
Muun: You can only try to pin someone when you're in control of the grapple. What you just tried to do is take control of the grapple (so that you're the one who can choose to end it at any time, or pin it next round), and since the Croc only rolled a 39 on his check, you succeeded. (Insert grumbling about overly-complex grappling rules here) ))
The otherworldly Dire Crocodiles - far more effective than the Porpoises and Octopi that the party is used to seeing emerge from Evaneth's summonings - waste no time in assailing the party. Knowing intuitively that the currently-fishy Quintus is by far the most dangerous among them, the hellish-looking beast attempts to swallow him whole; Quintus puts a panicked stop to that by emergency-teleporting to the other side of the room.
Meanwhile, the heavenly-looking croc picks on the somewhat larger giant squid that seems to have teleported into the monastery alongside the humanoids. It manages to clench its jaws around the sea-creature, but only for a moment; the slippery beast manages to wriggle its way out of the crocodile's jaws and wrap its appendages around its mouth, sealing it shut - at least for the moment.
As a shadowy Evaneth slams Val in the chest, the swashbuckler attempts to fight back in futility, unable to pierce the veil that seems to be protecting the bizarre monk/dark-arts-practitioner hybrid.
Jack attempts to come to Val's rescue, snapping his new, terrible jaws vociferously - to no effect; clearly Evaneth has learned a thing or two over the years about evading attacks.
((Fiendish Croc uses its reach to chomp on Val: 26 vs AC. That will be 29 damage. Free Grapple check: 35. Even if your modifier wouldn't be high enough, go ahead and roll it in case you get a Natural 20. If you don't meet or beat 35, you're grappled.
Celestial Croc attempts to escape Muun's grapple: 47 on the check.
Evaneth performs a Full Attack on Jack: 24, 24, 27, 11. Only the third one hits. On each attack, he attempted to use Stunning Fist. Jack must make a DC 24 Fortitude save, or he is Stunned next round.
I think that's everything. Here is my attempt at drawing a map of this mess. It's your turn))