The caster creates a small magical barrier around their next magical which instead of protecting the spell causes it to bounce of off the first object it hits (yes, this includes creatures).
Until this spell ends the next spell that requires the caster to make a ranged spell attack roll gains an additional effect. The spell attack roll has to be made at a disadvantage but can now bounce off of anything, allowing the caster to possibly hit an enemy around the corner. For this to happen the caster has to assign a location for the spell to initially hit whereupon the DM can decide whether this comes close enough to a target for the attack roll to count. An intelligence test can be made at the DM's discretion to decide whether the angle of the bounce is correct.
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