mask of death

[Eran]

in my time playing custom campaign there was a feature that really stood out to me and that is heroes with level 3 criticial strike with 1 or 2 mask of death in their inventory. notable mentions include dwarf campaign act 1 and half of the march of the horde v1.1 campaign where a kobold and grom hellscream were literally invincible because they keep getting their health back to full just by one crit that restore health back to them because of mask of death. when i played grom or the kobold hero i didnt even have to use mana just let the passive crit ability work with the mask to destroy entire bases alone. so im wondering if there is any other campaigns out there that has this unintended superpower effect.