Mage Slayer: Saving Throw Advantage
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Mage Slayer: Saving Throw Advantage is a passive feature provided by the Mage Slayer Feat. When a creature casts a spell near you, you have 
Advantage on any Saving Throws against it.
Description
When a creature casts a spell within melee range of you, you have Advantage on any Saving Throws against it.
How to learn
Granted by the feats: Mage Slayer