You see a troll guard
Abilities
Melee (0-15?).
Damage Taken From Elements
Physical 
Death 
Holy 
Ice 
Fire
Energy
Earth
Location
Rookgaard's central cave in the new western Troll tunnel, and north-west of Carlin during raids.
Behaviour
A troll guard will retreat at 2 to 17 (3.33% - 28.33%, deep red to red) health.
Strategy
Kill it like a normal Troll.