Aura of Mercy

You show mercy.

All creatures within 18m have their mortality threshold set to their creeping threshold. However, the aura of mercy transforms the mortality threshold from a killing effect into a stun effect that lasts until the end of the encounter. Whichever happens later. If a creature drops below their personal maximum negative hitpoints it still dies.

When the aura interferes with other effects that apply a mortality threshold or death effect, perform a competing level check with a +4 bonus. If you succeed, the auras merciful effect takes precedence and a creature that would have been stunned is merely stunned.