The Elk centaur, protector of the forests, is rumored to be an immortal servant
Monstrous Compendium - Mystara Appendix, pg. 8
Rules Cyclopedia, pg. 156
Monstrous DB for OD&D
Conversion for use as a 2e player character race by Rick LaRue in netMAG 3
3e stats by Valentius July 2005
3e stats by Robert J Schwalb April 2001
3e stats from the Creature Catalogue
See its Monster Lore entry by Gary Davies June 2007
4e stats by John Walter Biles Jan. 2009