Final chamber is straight up retarded with 18; the Voidwrought model IG has the most random hate ever and just trashes people locked in every single time effectively ending that run for the most part. Most we got killed was 1 mob after the IG, which you basically have no choice but to fight first because it's gonna come for your alli regardless of who aggros him.
Uptala dropped Kagotsurube if anyone cares.
Oh also, apparently you can drop the Uptala to 1% and it won't die until it successfully casts Kaustra; at that point all damage just does 0 and you have to wait until it decides to fall over.