Momento

The momento is a 10th-level spell that was unleaded by an unknown Dromish wizard. It trapped all full-blooded Drow in the Undercropolis in a time stasis. Creatures trapped in this way cannot be hurt, age, need to eat, or moved by any force. The only known was to remove the spell is known only by Mage Hunter Il'Karin, though it is known to require the destruction of a Staff of Power. - from the journals of Old Jass