Andariel
From Annihilus Wiki
Location: Catacombs Level 4 - Same as normal D2
Attributes: Everything about her is the same as on normal D2 except her hp is much higher.
Spells: Same as normal D2
Unique Drops: Blue Worldstone Fragment - Drops about 1/10 runs without quest bugs. Multiple fragments can drop at once though. Lesser Orb of Potential - Its drop rate is similar to that of fragments.