Vethin's Visional Vault

From publisher blurb:

Mini-Dungeon adventure for 4-6 characters of levels 11-12

Vethin’s Hold’s leaders—whom all the Underworld considers foul—happily “forget forever” whatever annoys them.

Renowned swordsmith Gladior Wispre-Asako, a half-drow assassin whose merciless indifference in the arena drew glory and adoration, did just that. Her fame grew too great, so she was “disappeared.” But nobody recalls when it happened: two years, two decades, two centuries ago? Hopefully it was recently because the party finds itself having to search for her and return her alive.