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5 years ago
I understand that the caster first completes the casting,
then the Mage Slayer feat (PHB, p. 168) triggers and allows the character to attack as a reaction.
If the spell requires concentration, what will happen if the caster fails the concentration check? Specifically, does the spell fail before taking effect, or does it take effect briefly before getting cancelled?
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Feb 22, 2018 at 10:04
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In the event that the concentration of the caster has been broken by a Mage Slayer reaction attack to the casting of a spell, then the spell takes effect briefly before dissipating
The Mage Slayer attack action takes place after the spell has been cast, and thus had its initial effects resolved.
The order of operations is:
Caster casts spell
Spell effects resolve (including any saving throws)
Mage Slayer gets their reaction attack
If it hits and the spell was a concentration spell then the caster performs a concentration check (with disadvantage from Mage Slayer)
If that check fails then the spell dissipates
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Feb 22, 2018 at 10:25
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