Chittr’k’k

The demon lord is an upright and partly-humanoid large, redeyed rat. His grey-white fur is sometimes spattered with offal and flecked with blood; other times, he is groomed constantly by swarms of ordinary rats. Chittr’k’k’s tail is tipped with a strange greenish fire. His front paws are long-fingered in the manner of rats, fully capable of holding and manipulating wands, scrolls, and other objects. He has long gold incisors, a short snout, and large ears (often ornamented with black or golden rings). He often smokes a magical pipe filled with mortal souls, drawing necrotic energy from this unhallowed vessel.
Chittr’k’k finds human weakness amusing and delights in cruelty. While still given to unbridled destruction, he is sometimes more cunning than other demon lords. He is able to destroy a crop or a city with equal joy. He justifies this as “vengeance for my brethren”—for all rats are his worshippers and slaves.
Chittr’k’k’s power comes in part from eating entire legions of mortal souls, and he dreams of attaining godhood through the devouring of demons. Rattok demons are said to be his creations.
Chittr’k’k keeps a vast network of spies in the mortal world. All red-eyed rats are his servants, chittering their knowledge of blood, sacrifice, and misery to their dark lord. Chittr’k’k uses this information to give his followers greater reach, to destroy granaries, to starve entire nations, and to spread disease and misery everywhere his long-fingered claws reach.