Requiem V1.53 on Legendary, NPCs beating Frost Troll

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Several NPCs attacking Frost Troll with MASSIVE regeneration ability. There are Revelers and 4x Khajiits (Kharjo&co.), Vilja the Bot and reanimated spider which keeps troll paralyzed. I dropped weapons to ground for revelers to pick up. I watched this about half an hour and then turned difficulty down few notches causing troll to die instantly.