Bitbrain
Lost in Dark Sun
An alternative rule for Defiling, based on the Blight spell:
Any arcane magic-user can choose to Defile when he casts another spell. If he does so, treat the Defiling as if he cast a Blight spell with a range of 30 feet, centered on himself. Every creature in the zone suffers the damage. Sum up all the HP taken by every victim of the Defiling. Add that total to the damage done by the other spell that was cast; this damage is necrotic.
Of course, the outside-the-game problem is that a Defiler falls into two categories:
(1) he doesn't hurt his allies (much) - and therefore the Defiling doesn't really have any effect on anything else. Why defile, or worry about it?
(2) Defiling is powerful, it affects both friend and foe, and his allies have to keep creating new characters because the Defiler keeps on killing them.
In the original 2e Campaign setting, only the Dragon could use defiling to harm other creatures . . . I think that this would be way too powerful for PCs.
My solution would be:
ARCANE DEFILING
Immediately before you cast a spell, you strip the surrounding environment of the capacity to support life. The radius of this effect is equal to the expended spell slot level x 10 feet (10 feet if you cast a cantrip).
All creatures within the area-of-effect have disadvantage on their next attack roll, and all plants that are not creatures---even those created by magic---immediately wither away and die.
disadvantage on first attack is easier to remember, and seems less mechanically complicated to me.
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