# Mage Slayer > [!info] Feat Details > | | | > |---|---| > | **Source** | Player's Handbook (2014) | > | **Categories** | Buff, Debuff, Combat | --- ## Description You have practiced techniques useful in melee combat against spellcasters, gaining the following benefits: - When a creature within 5 feet of you casts a spell, you can use your reaction to make a melee weapon attack against that creature. - When you damage a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration. - You have advantage on saving throws against spells cast by creatures within 5 feet of you.