A named threat of The Wildlands, encountered rarely and never in numbers - real Dungeons & Dragons statistics, no auto-computed shortcuts.
Layered on top of the module's own combat AI, which still picks targets and positioning. The fight below moves through real hit-point-gated phases; every save DC and attack bonus computes from the stat block above at runtime.
Kiting him doesn't just fail to feed his fury - it actively starves it.
Every ally lost since the last check banks him a lasting reward, and it's never taken back.
Every debt banked is spent in one cleave, and from then on his fury only ever climbs.
CR 20 is set against The Wildlands's own real ambient ceiling, not auto-computed from level alone - a genuine Barbarian 16 / Legendary_Dreadnought 4 build at 20 total levels.
Hit points (299) follow this project's own average-hit-dice convention, and every save/attack bonus derives from the ability scores above at runtime - nothing here is hardcoded past the phase gates themselves.
Boss-flagged (bypasses the drop-rate roll, two loot-generation passes) and gated to a single spawn - only one Gorrukk Ashjaw is ever up in The Wildlands at a time.