Key Compendium

Tarnished Bronze Key - drops from 'a priest of najena', unlocks nothing.

Small Stone Key - drops from 'a reanimated hand', unlocks the magus room.

Polished Brass Key - drops from 'reclusive ghoul magus', unlocks the bar room.

Scuffed Silver Key - drops from 'an undead barkeep', unlocks the tower.

Cracked Glass Key - drops from 'an undead knight of Unrest', unlocks the basement

Note: These keys only drop in classic era and are only needed during classic era, afterwards they become unlocked.