One-Hit Protection Enchantment

The idea is an enchantment preventing a player with full health from dying in one hit, possibly excluding fall damage. This would be a good way to balance against maces and many traps. It would leave them with an amount of health, scaling by level. (i.e. level one at a single point or 1/2 a heart. two with two points for one heart, or three for six whole points, three hearts.) It may even be better than totems if a player doesn't wish to farm raids with the new 'raid omen' effect requiring more waiting and attention.