Brittleskin

3rd-level transmutation (Cleric,Druid,Paladin,Ranger)

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• Casting Time: 1 action
• Range: 50 feet
• Components: V, S, M (a shattered crystal)
• Duration: Concentration, up to 1 minute

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You make a creature's armor or other outer covering crystalline and brittle, so that each time the creature is struck, shards of crystal break and are driven into its skin. Choose one target within range, which must make a Wisdom saving throw. On a failure, the target suffers a penalty to its Armor Class equal to your spellcasting ability modifier (minimum 1). For the duration, whenever a target that failed the saving throw against this spell takes bludgeoning, piercing, or slashing damage, it takes additional damage of the same type equal to your spellcasting ability modifier.