Mage Slayer
Complete guide to the Mage Slayer feat in D&D 5e. Punish spellcasters, disrupt concentration, and make enemy mages regret getting close to you.
Benefit
You excel at disrupting spellcasters, gaining reaction attacks when they cast, imposing disadvantage on concentration saves, and gaining advantage on saves against close-range spells.
Mechanics
Mage Slayer provides three anti-caster benefits: **Reaction Attack on Casting:** 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. **Concentration Disruption:** 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. **Advantage on Saves:** You have advantage on saving throws against spells cast by creatures within 5 feet of you. **Important Details:** - Reaction attack happens before the spell completes - Works even if the spell doesn't target you - Concentration disadvantage stacks with other effects - Save advantage only against spells cast within 5 feet - Helps shut down enemy spellcasters in melee
Synergies
- *Sentinel feat - Lock down casters and prevent their escape
- *Barbarian Rage - Advantage on saves already, close gap quickly
- *Mobile feat - Close distance to casters and avoid opportunity attacks
- *Counterspell - Different mechanism, similar goal of stopping spells
- *War Caster - If you're a gish, counter enemy casters
- *Tunnel Fighter (UA) - Multiple reaction attacks per round
Common Mistakes
DM Tips
Sources & Further Reading
- Mage Slayer — D&D 5e Wikidot — Full SRD feat text
- Feats — D&D Beyond — Official feat list