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Mastering Magic

Spellblights

Source Ultimate Magic pg. 94
Spellblights are rare and unusual magical conditions that uniquely affect spellcasters, including creatures that use spell-like abilities. Spellblights are curses, some functioning continuously and others manifesting only when the afflicted creature attempts to cast a spell or use a spell-like ability. A creature that lacks the ability to cast spells or use spell-like abilities cannot usually be afflicted by a spellblight.

Unlike many magical effects, a spellblight usually persists in an antimagic field, though because they often affect spellcasting, their effect is typically lessened in such a field.