Zushaxx

Zushaxx was the current Xanathar (title) as of 1492 DR,

History
Zushaxx was apparently the fourteenth Xanathar, as thirteen Xanathar corpses remained in the lair he resided in.

Possessions
Xanathar wore a ring of invisibility, a ring of mind shielding and a ring of resistance on It's eyestalks.

Appendix

 * Adventures
 * Waterdeep: Dungeon of the Mad Mage (mentioned only)
 * Waterdeep: Dragon Heist
 * Waterdeep: Dragon Heist