When an enemy casts a spell within range of the weapon you are currently wielding (examples: 5ft, 10ft w/reach, 20ft w/some thrown weapons, 30ft w/hand crossbow, etc), you may use your reaction to make an attack against that enemy. If it hits, the spellcaster must make a concentration check with a dc equal to half the damage dealt or 15, whichever is higher. If they fail the concentration check then the spell fails, the spell slot/spell like ability is used, and any components that would be consumed in the spell are consumed so long as the spell had a casting time of one action or less. If you have the mage slayer feat then the caster has to make this check at disadvantage.
Also, if you have the mage slayer feat, you may extend the range at which you have advantage on saving throws against spells by 25 feet to a total of 30.
You may use this technique a number of times per day equal to twice your proficiency bonus (range extension counts as a use).
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