Slime for the Slime God!
Gretell says...
bone dragon (D)

A mighty undead abomination, pieced together from the broken bones of many dragons by powerful necromantic magic. The collective despair of such desecrated dragons gives this horror its own undying breath weapon, in billowing clouds of excruciating misery.

Speed: 10 | HD: 20 | HP: 138-182 | AC/EV: 18/2 | Damage: 30, 20(claw), 20(trample) | undead, evil, see invisible, fly, unbreathing | Resistances: will(100), fire, cold, elec, poison+++, drown, miasma, neg+++, foul_flame, torm | Vulnerabilities: holy | XP: 2222 | Spells: m.sorrows [!AM, !sil] | Size: Giant | Intelligence: animal.
Henzell says...
  1. Undead dragon with enormous AC, resistances for days, and strong melee damage instead of a breath weapon.
  2. Prior to Yred's 0.28 rework, one of the two best (and capped, since 0.16) undead gifts.
  3. Prior to 0.7, were called skeletal dragons. Prior to 0.12, were speed-8.

Information based on master branch and the great LearnDB.
© Dungeon Crawl Stone Soup, 2010.