Shadowmere (Oblivion)

Shadowmere is the horse, in oblvoin that the PC (you) gets after completeing the ritual of purification, shadowmere is one of the fastest horses in the game. If you are overencumerd while traveling, you can beat shadowmere, and knock it out and search its body and place any object or weapon on her and the stuff will never dissapeer and shadowmere should wake up. (she is a traevling chest)