Khazan

What we know

Archmage who once lived in Barovia; employed by Strahd von Zarovich at height of power (Session 12 @ 01:51:07)
Khazan's Wizard Tower on Lake Baratok coast west of Vallaki per Victor Vallakovich (Session 12 @ 01:39:42)
Said to rival Strahd in magical ability; lust for power destroyed him (Session 12 @ 01:51:07)
Victor Vallakovich believed tower held impressive magical tomes including Mordenkainen volume 2 (Session 12 @ 01:39:42)
Victor urged caution—traps likely remain (Session 12 @ 01:52:09)
Dead for centuries per Arabelle at tower; long abandoned before Nightingale moved in (Session 13 @ 03:15:18)
Tower entrance riddles themed on power; password opens as Kazan (Session 13 @ 02:34:31)
Anti-magic field throughout tower interior (Session 13 @ 02:40:43)
Party recovered dried wolfsbane and Mordenkainen Ethereal Entities volume 2 from chest (Session 13 @ 03:13:46)