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Tenebrous Spell (Metamagic) Source Inner Sea Magic pg. 15 You blend shadow into your spells, increasing their efficacy at the price of susceptibility to light. Benefit: When you cast a tenebrous spell in darkness or dim light, the spell’s effective caster level and any associated save DCs are increased by 1. Any attempts at dispelling a tenebrous spell in darkness or dim light take a –2 penalty on the dispel check. Casting a tenebrous spell in bright light is difficult, and requires a concentration check (DC 15 + twice the tenebrous spell’s effective spell level). Attempts to dispel a tenebrous spell in bright light gain a +4 bonus on the dispel check. You cannot use this feat on spells with the light descriptor. A tenebrous spell uses up a spell slot one level higher than the spell’s actual level, except in the case of spells with the darkness or shadow descriptor or of the illusion (shadow) subschool; this feat does not change the effective level of those spells (but still counts as using a metamagic feat for all other purposes).

Tenebrous Spell (Metamagic)

Source Inner Sea Magic pg. 15
You blend shadow into your spells, increasing their efficacy at the price of susceptibility to light.

Benefit: When you cast a tenebrous spell in darkness or dim light, the spell’s effective caster level and any associated save DCs are increased by 1. Any attempts at dispelling a tenebrous spell in darkness or dim light take a –2 penalty on the dispel check.

Casting a tenebrous spell in bright light is difficult, and requires a concentration check (DC 15 + twice the tenebrous spell’s effective spell level). Attempts to dispel a tenebrous spell in bright light gain a +4 bonus on the dispel check.

You cannot use this feat on spells with the light descriptor. A tenebrous spell uses up a spell slot one level higher than the spell’s actual level, except in the case of spells with the darkness or shadow descriptor or of the illusion (shadow) subschool; this feat does not change the effective level of those spells (but still counts as using a metamagic feat for all other purposes).

Archives of Nethys

Tenebrous Spell (Metamagic)