The Champion's Belt was finally fought!
...and as always, I have thoughts/comments/errors to point out.
a) Ulgurstasta is mis-spelled in the 5e conversion document as "ulgurstata"
b) the "to hit" for the ulgurstasta should be +15, not +10, given the 30 STR
c) An ulgurstasta has an 18 INT and +9 on History? Weird, and not super useful given that it can't speak.
d) Khellek has 29HD but is only 15th level. I assume it's for balance reasons, and the extra HP are certainly needed, but I might have gone with 15HD and just given more hp per HD.
e) Why doesn't the ulgurstasta just breath on the crowd as soon as it appears and create lots of Spawn allies? I mean, other than "it would destroy the players", though the chaos of the Spawn fighting the crowd would certainly add some tension. I assume the ulgurstasta is focused on what it has been summoned/created for - Auric.
f) What I totally didn't expect, and I'm not sure why, is that when the ulgurstasta emerges in the arena that they would immediately ally with Auric and Khellek. I let the battle go on for a while before the emergence, because they really wanted to battle it out, and it made for a great heroic moment when one of the heroes took his action to rescue Khellek from the giant green worm and that helped convince Khellek that this wasn't a trick. But I'm not sure the ulgurstasta stats reflect having two extra good guys.
g) The ulgurstasta wants to swallow Auric. But Auric does an incredible amount of damage and can almost always cut his way out again. I mean, you don't want the Free City to turn into thousands of wights, but still, they were on the precipice and the problems solved itself when Auric hacked free.
h) They were very disappointed to not be crowned winners at the end, as they were clearly winning. The adventure says that Talabir is only too happy to hand out the prize, but is the expectation that after the ulgerstasta falls, they keep on beating on Auric and Khellek? That would be savage!