Skyreach Bastion is a storm biome that runs up to Threat 25, and everything in it is Storm — so Shock and the Overload payoff are the language of the fight. Thunderroc waits at the end, with 930 health and 8 Uniques to give up.

A run through it lays out 27 rooms — 1 entry, 17 combat, 2 boss, 2 transit, 1 shrine, 2 branch, 1 loop and 1 placeholder — and draws 0–10 of the combat ones on any given floor. Come in around level 4.17 for every Threat step you are attempting, with about 12 power for each of your levels.

2 creatures from the shared Demon crowd are swapped out here: Imp → Static Chick and Imp Overlord → Thunderroc.