The Hollow Men

Hollow Men are fey servants or manifestations associated with the Briarheart in the folklore of Haldrenn. They are humanoid in form, but made of brambles, thorns, and sticks. In lore, they are said to avenge the Briarheart when he is aggrieved by the misdeeds of mortals.

An ancient rhyme survives, describing them:

Knock, knock, knock;
The Hollow Man calls.
Swing, swing, swing;
His greedy sickle falls.
Chop, chop, chop;
He takes another head.
Burn, burn, burn;
The Hollow Man is dead!