Avernus Fried Chicken

Avernus Fried Chicken is a level 18 outsider that (very rarely) can appear as one of the Summons available to a Hellfire Warlock via the second level feat Summon Baatezu. From the in-game description, Avernus appears to be an easter egg:

Though outwardly it resembles a humble chicken - albeit engulfed in flames - sordid are the tales of the dreaded Avernus Fried Chicken. From the writings of the mad scholar Anvandyr in 1028 DR:

Lo, and in the ages past, there lived on Toril great and terrifying birds, who rent flesh and snapped bone. When at last the final member died, Gargauth, God of Cruelty, took notice. Noted he the viciousness of the creature, and in appreciation he took up its soul and dragged it hither to the Nine Hells.

"Lo! Hearken and I fear! So did the Tenth Lord of Nine - with darkest rites and ancient incantations, use a horrifying mix of eleven cursed herbs and demonic spices to clothe the soul of the beast in a humble frame, forever wreathed in the flames of the Hells!  For eternity, until Ao extinguishes the Sun, shall the dread Avernus Fried Chicken peck about at the feet of its master, its dark god!  Forever shall the fumes rising from its twisted body tantalize and charm its prey, until its hellish form is upon them, rending their flesh with its talons and charring their eyes in their sockets!"

"Quake at this revelation... and shudder that the Lost Lord of the Pit may send such a beast to you that you may hear its hideous squawk tear through the nigh!"

Aged to the realms of forgotten infernal lore, with an armor class of 45, 306 hit points, a base attack bonus of 18, regeneration, and spell resistance of 32, one thing for certain can be said of Avernus: he is one tough old bird.