[Ranylyn]

As someone who's played Tactics Ogre and Final Fantasy Tactics, both of which used an undead revival timer, I'd like to support Sarin's suggestion.

Why? Because it just makes sense for a race with those stats from a gameplay perspective. A potenial big threat that's decently easy to deal with temporarily and buys you a few turns to see to everything else, but will get right back up if you're not done by then. In both PVE and PVP this can lead to interesting dynamics, and I think it has potential to be well balanced, considering.

It doesn't entirely suit Lich lore, sure, since they'd ideally return to their phylactery, but it could maybe be an activated racial skill to feign defeat when "near death" (hitting 0 hp) while instead spending a few rounds to recover and regain your power.