As two actions, a creature that you can touch or see within 10 meters starts experiencing a heart attack. At the start of each of its turns for the duration, the creature must make a Fortitude saving throw. If the creature is a construct or an undead, the spell has no effect on it.
On a failure, it takes 4d6 necrotic damage and is stunned until the start of its next turn.
On a critical failure, it takes twice as much damage.
On a success, it takes half as much damage and and the effect ends.
On a critical success, it takes no damage and the effect ends.
You can increase the damage by 4d6 for each additional mana expended. If this spell is augmented to target additional creatures, this damage is halved.
You can target one additional creature for each additional mana expended. The creatures must be within 5 meters of each other when you target them.