That is a horrible assumption to make. And while, yes, the horses do die quite quickly from falling damage, having them as all completely invincible would make there being more than one horse pretty obsolete. And Shadowmere isn't invincible, she just has huge health and regen rate.I'm going to go on a rant with the horses here. I assumed that all horses were invincible in this game (like shadowmere and Marboral's horse in oblivion) but apparently only *SPOILER ALERT* Shadowmere is the only invincible horse (yes, she returns!!). Please tell me I'm not the only one who wasted my money on a horse and had it die like 5 seconds later in a dragon battle or some stupid shit like that. Also, I think it's pretty gay that you can't fight while riding a horse.