Purple llama
A Purple Llama is a rare result of casting the Magery spell of Energy Vortex. The llama will have the same effects and attributes as a normal energy vortex. It was initially a graphical bug, but due to popular demand was intentionally left alone and is now considered a de facto Easter Egg.
The odds of getting a purple llama are (loosely) estimated to be 1 in 1000.