Grimreaver is the last boss of Skûmfil, right side .
-  The Stinking Ward Fellowship
Always present on Grimreaver:
- Power of the Pack -- With every Lesser Fell Corpse-claw at his side, he gains a boost to power regeneration.
- Power Charge --Grimreaver has an innate disease cloud surrounding him.
- Sick Air -- "You will hurt soon, <player name>!"
- Plague Infection Countdown -- "You get sick, <player name>"
- Heavy Acid DoT
Grimreaver is the king of the Kergrim in Skûmfil and is able to summon many Lesser Fell Corpse-claws to his side, each of which grant him a boost to power regeneration. In addition, there is a debilitating disease cloud surrounding him and he will knock back those who are near him. Periodically he will call out a combatant's name, stun him and nearby fellows, and inflict a heavy Acid damage over time or a morale-removal countdown disease.
Leaving the corpse pile he claimed from the Grodbog queen, Brúmbereth, with corpse-claws following will not reset this boss. Grimreaver is able to hit players with an attack beyond his line of sight, making an attempt to flee difficult.
Defeating Grimreaver, together with 4 other Skûmfil bosses completes the deed The Corpse-eaters which grants:
- "You are too strong!"
- "You not take food!"
- A Grimreaver came long ago to the corpse-piles of Skûmfil. He is old and deadly, and there's a keenness to his glance that his lesser kindred lack.