Room 1665 is a stage in Vampire Survivors, unlocked by using the spell "forbiddenbox". It contains the Darkasso relic.
Description[]
Seemingly bottomless, the down-reaching doors of this huge, infernal contraption open only when fed the blood of monsters. Summoned by the baneful behavior of a long forgotten clan, the unfathomable depths of these haunted halls whisper with a putrid power that yearns for innocent souls to play with.