Heretic’s Null

General feat (Prerequisite: level 4+) — Campaign homebrew for Heretics of the Old Gods

Magic dies around you. It always has. People feel it before they understand it — the spell that guttered, the ward that wouldn’t hold — and then they understand it, and then they’re afraid of you. You gain the following benefits:

• Ability Score Increase. Increase your Constitution by 1, to a maximum of 20.
• Null Field. You radiate a 10-foot-radius aura of magical suppression that is always active and affects every creature within it, friend and foe alike. A cantrip cast within your aura automatically fails, with no saving throw. When a creature casts a spell of level 1 or higher whose level is equal to or lower than your proficiency bonus while within your aura, it must succeed on a Constitution saving throw (DC = 8 + your proficiency bonus + your Constitution modifier) or the spell fails and is wasted, expending its slot and action. Your aura can disrupt a number of leveled spells equal to your proficiency bonus per round; once that many have been affected, the field can’t disrupt further leveled spells until the start of your next turn — cantrips are still nullified. Spells of a level higher than your proficiency bonus, and effects that aren’t spells, are unaffected.
• Dead to Magic. The vacuum doesn’t tell friend from foe, and it doesn’t spare you. Magical healing restores only half as many Hit Points to you (rounded down), and you can’t gain temporary Hit Points from spells or other magical effects.