Unique item concept "emancipation from flesh"

unique amulet emancipation from flesh
-has 1 socket
-do not take damage to life while guard skill is active. (but can still be one shot to big enough hit).
-life and mana values are influenced only by character level (at lvl 100 life=1248, mana 644)
-socketed guard skill has no cooldown and is automatically triggered once expires (either from taking damage or elapsed time)
-depleting guard skill (from taking damage) reserves 300 flat mana for 20 seconds.
-gain extra mana equal to reserved life (ignores first mod, so guard skill may be recasted more in those 20 seconds).
-damage bypasses energy shield and mana
-immune to damage over time.

notes:
essentially can skip investing to mana and life and it even promotes reserving life. Molten shell would add 6666 hp for example, also guard skill will fail to recast if there is no more mana left to reserve due to continuous guard skill breaking. You can also use ward since it should only break if life gets damaged. Immunity to damage over time can also be exploited.