Scarab, Ruin 2014
CR 6 undead
Large undead, neutral evil
STR17 (+3)
DEX14 (+2)
CON16 (+3)
INT3 (-4)
WIS14 (+2)
CHA4 (-3)
Flesh-Eating Aura.
When creature that doesn’t have all of its hp starts its turn within 10 ft. of scarab creature takes 2 (1d4) necrotic. Also magical healing within 10 ft. of it is halved.
Silent Steps.
No sound emanates from it whether moving attacking or ripping into a corpse. Has advantage on Dex (Stealth) checks and each creature within 5 ft. of it is deafened.
Undead Nature.
Doesn't require air food drink or sleep.
Unstoppable.
Moving through difficult terrain doesn’t cost it extra movement and its speed can’t be reduced.
Reactions
Relentless Pursuit.
When a creature within 10 ft. of the scarab moves away from it scarab can move up to half its speed toward that creature.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details