| A dragon consecrated to the holy divine powers. Its breath is blessed fire, and its claws sear its victims with divine wrath.
“On the other hand, Confucius is made to say to his disciples, ‘I know how birds can fly, how fishes can swim, and how animals can run. But the runner may be snared, the swimmer may be hooked, and the flyer may be shot by the arrow. But there is the dragon. I cannot tell how he mounts on the wind through the clouds, and rises to heaven. Today I have seen Lao-tsze, and can only compare him to the dragon.’”
Pearl dragons are one of the few non-angelic holy monsters in the game, and are an absolute menace to undead characters; while normal characters won't have an easy time with them, the undead take 1.5× normal damage from holy sources. Their unique Cleansing Flame breath attack deals 3d36 irresistible damage and creates clouds capable of dealing up to 36 damage per turn spent in them (vs. the undead, that means up to 162 damage per breath with 48 damage per turn spent in the clouds). Pearl dragons are very rare, only occurring in holy-themed Pandemonium or Ziggurat floors. (As of 0.14, pearl dragons may also be found in holy-themed vaults in the Depths.)
Tips & Tricks
Butchering a pearl dragon corpse may produce a pearl dragon hide, which you can enchant to create a pearl dragon armour. This is an excellent suit in terms of high AC and low EV penalty, and provides rN+. Unlike most dragon armours, it provides no special defense against the breath of the dragon who provided the hide.