Those skills I hope are inheritable... would be awesome on other heroes too. Best one is THARJA by far but will have to see her ivs. It looks like they all have pretty low hp though.
I hope it's exclusive to armoured units only because by then it will be EVERYWHERE due to the convinience of most good skills requiring reuiced HP. It would be boring.
Units using Life and Death usually hold Ardent Sacrifice, and usually have Desperation in their kit. This can be achieved with Brazen Skills and to better effect.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes