Yeth hound

A yeth hound was an intelligent outsider that hunted during night.

Description
A yeth hound looked like a big grey hound with glowing cherry-red eyes. When not found alone or in a pair, they organized themselves in small packs consisting of several to a dozen members.

Phobia
As mentioned above, yeth hounds hunted at night. Despite suffering no ill effects, they suffered from an irrational fear of the sun and never went under sunlight. "Never" was meant literally; if they had a choice between going out under the sun and surviving, or staying out of sunlight and dying, they chose the latter.

Abilities
Yeth hounds had good senses, sight, and hearing but their sense of smell was especially good. They were better at tracking prey by smell than other indicators.

They could run faster than humans and were good flyers who could fly even faster, despite having no wings. They glided a bit above ground to hunt and could stop and resume flying with ease.

Their most special ability however was their voice. When a yeth hound barked or howled, those who weren't evil outsiders in a 300 ft. (91.44 m) radius were filled with an irrational fear that made them run away from the barking yeth hound.

Combat
Yeth hounds fought by biting their enemy. Their bites were aligned to evil and once bitten their enemy was in danger of being tripped by them without being able to properly react to it.

Society
They couldn't speak but could understand Infernal.

Yeth hounds were one of the servitors of the drow deity Vhaeraun, whose realm was Ellaniath.

Background
The yeth hound is based on the yeth hound of the folklore of Devon, a headless black dog known for its wailing.