Birb of Eldrun - Cold Storm Totem + Wereraven Primalist - SR30-31 - 1SR - Grim Dawn 1.3.0.8.

Caaaaaw: https://www.grimtools.com/calc/ZrGrx7kN [Corvid chattering about how this build works and grumbling about the set and frustrations...] Wait, human time - so finally solved this, took ages, but the key was to revert to Wereraven skills and also use the Mythical Celestial Stone of Halakor. Solving the issues with Storm Totem being seemingly weak, but also increasing Frostburn a surprisingly large amount. Also - craft everything for Physique%+ Anyhow, average is going to be about 5 minutes, very dependant on boss rolls. This is also a fragile build so remember to kite, gtfo and use Bloodthirster to save your rear. Though it can take on up to 4 bosses. Sometimes. Just depends on the combos. Also, you can go with a full Ultos dev path, including Ghoul. But it's got lower OA so gets less crits. And the high OA this now has is part of why it's so fast. Thanks also goes to the GD discord for pointing out I should try the birb skills. Annoyingly Chillspikes does more dps, but with Ice Talons and Cold Snap we can get Untamed Rage to stay up longer. Which in turn is part of why this build now works a lot better. Oh and I wasn't expecting a sub 5 minute result either, because SR's been throwing sparse rooms at me for the last 3 hrs of testing lawl.