"A large, gold-framed mirror.
You can clearly feel the magic radiating off of it."
The Mirror is an item found in Prisoners of the Elder One. It is found in the coffin in the Crypt Nexus, opened with the Crowbar, and gives the Talisman when used in the Nexus. Rania refers to it as the Mirror of Altenak, an item with a dangerous curse (something that befalls Erik if used repeatedly), and she will trade the Warding Crystal for it. This, the Hand Mirror, and the Mirror Shard can also be used to get through the lasers guarding the Yellow Gem.