Tanked this last night through 29 rounds (assumed since aug reward was XXIX). Mob turned red con about round 23-4.
Initial round max hit was ~1k, no spells noticed.
Acid blast started landing ~round 6
Flamethrower started landing toward 20th round. NASTY dot for 14k/tic to front arc.
By my final round, IRA was hitting for max 30k (seldom) on me (89 war, 30CS, max def mods, 6.7k AC with bracing def running).
The mob's accuracy is terrible. With commanding voice, it could go 3 rounds without landing a hit (31CA). What finally wiped us was the adds plus flamethrower.
Good luck.