Mazthoril

Mathorzil is a huge and deep icy cavern - populated by the Cobalt Brood, their matriarch being the radiant Haleh - only encountered in high elf form at the peak of the cavern, accessible by magic runes. It is she who completes the key to Onyxia's Lair. Haleh has 3 powerful dragons who guard Mathorzil, and leads a sizable army of highly sorcerous spawn and young whelps. Spellmaw is the broods main patrol, and wanders a slow path around a good 3rd of the lower section of the Winterspring. Manaclaw and Scryer Guard the runes at the rear of the Cavern.