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