5e SRD >Spells >

Titan’s Resonance

6th-level transmutation

Casting Time: 1 action

Range: 100 feet

Components: V, S, M (a glass 8-sided polyhedron worth 50 gp that is shattered during casting)

Duration: Concentration, up to 1 minute

When you cast this spell, a 100-foot radius centered on you is saturated with magical energy, empowering arcane spells that are cast within it. Arcane spellcasters within the area, or who enter the area during the spell’s duration, must select a single spell that they can cast at each of their spell slot levels. For each time any such spell has been cast within the affected area during the duration, that spell receives a +1 bonus to its save DC or its to-hit if it requires an attack roll whenever it is cast again.

If an arcane spellcaster attempts to cast a spell that they did not select, the spell fails automatically, without effect or explanation, and uses up the spell slot.

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