To spawn the Crypt Bunny, the player must kill at least six Cerberus and all the Tartarus in the Walk of Stolen Truths area. The Crypt Bunny then has a 20% chance of spawning at the eastern side of the area. The Wolf genus enemies respawn at a faster rate than usual. When they stop respawning, the Crypt Bunny appears.
There appear to be multiple potential spawn points. Two confirmed locations are by the Southern Golem in the icy gorge-like area, and on the northernmost path.