Thrall of Loken

Thrall of Loken
Thralls are strange creatures seemingly made from pure shadow, and emit an aura of pure dread. The party fought a Thrall, summoned by the Disciples of Loken.

Appearance
A writhing mass of shadows that resemble the dark exaggeration of a man. They float through the air leaving a trail of shadowy tendrils, and where they face should be is an unending darkness - as if you're staring into a void.

Abilities
They seem to be impervious to damage, and emit an aura of dread to those around them that causes them to fall to their knees and become helpless. Only those who overcome this fear, seem to have the ability to harm the creature. When touched by the creature, the victim is overcome with an intense weakness, having their own strength sapped away.

Strangely, the creature seems to be personal to those around it. The terrors it exposes the victim to are unique to themselves, to some it could be their family being murdered - to others themselves failing a task they dedicated their life to. The Thrall only ceases to exist once those around it do not fear it's presence.

Origin
The origin of such creatures isn't fully known, but it seems they are summoned by those who tread a dark path. They seem to be manifested from fear itself, gaining power as those who fall victim to the dark ritual slowly lose their minds.