A named threat of Shiven's Den, 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.
A single dragon-fear rolls out before the first blow is even struck.
A sonic cone recharges on schedule no matter how the fight is going, winning or losing alike.
A knockdown buffet, then a permanent grace that comes from never touching the ground again.
CR 22 is set against Shiven's Den's own real ambient ceiling, not auto-computed from level alone - a genuine Dragon 26 build at 26 total levels.
Hit points (400) 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 Shiven is ever up in Shiven's Den at a time.