D&D 5E Mage Slayer feat, order of actions and concentration.

[ECMO3]

Mage slayer Feat:

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.

So if a creature casts a spell and you attack it, what are the order the spell, attack and concentration take place. Specific examples:

1. Mage casts Misty step, do you get your attack before he is gone?

2. Mage casts hold person on you. Do you attack before you roll the save? If you attack after the save does that mean you can't attack if you fail the save? If you attack before you save does the Mage roll concentration if you hit?

 

[Bill Zebub]

Whatever is least advantageous for the stinkin’ caster.

 

[DND_Reborn]

So if a creature casts a spell and you attack it, what are the order the spell, attack and concentration take place. Specific examples:

1. Mage casts Misty step, do you get your attack before he is gone?

2. Mage casts hold person on you. Do you attack before you roll the save? If you attack after the save does that mean you can't attack if you fail the save? If you attack before you save does the Mage roll concentration if you hit?

Reactions interrupt other actions, so I would say the reaction happens before spells are even completed.

If you hit the caster, they must make the Concentration check or their spell is ruined.

 

[Nikosandros]

The DMG states that reaction timing depends on the specific reaction and if, as in this case, the timing is not specified, it resolves after the trigger finishes. Specifically, Sage Advice has stated that misty step would resolve before the attack.

 

[DND_Reborn]

The DMG states that reaction timing depends on the specific reaction and if, as in this case, the timing is not specified, it resolves after the trigger finishes. Specifically, Sage Advice has stated that misty step would resolve before the attack.

Yeah, that is the official stance, but IMO makes the feat nearly worthless.

So, I go with what makes sense logically.

 

[billd91]

Yeah, that is the official stance, but IMO makes the feat nearly worthless.

Against misty step, dimension door, or teleport, sure. But that's, what, 3 spells out of how many that could potentially be cast? The feat is not even close to being nearly worthless.

 

[Ruin Explorer]

The DMG states that reaction timing depends on the specific reaction and if, as in this case, the timing is not specified, it resolves after the trigger finishes. Specifically, Sage Advice has stated that misty step would resolve before the attack.

Yeah though it's worth noting that interpretation is imho dumb as hell because it makes Mage Slayer almost completely worthless, and it's already and weak and very situational.

 

[Ruin Explorer]

Against misty step, dimension door, or teleport, sure. But that's, what, 3 spells out of how many that could potentially be cast? The feat is not even close to being nearly worthless.

It also makes it very weak against all sorts of CC spells, wall spells, forced movement spells and so on.

And you're mistaken. The Feat was already close to worthless. That interpretation just pushes it over the edge into actively being there imho.

 

[DND_Reborn]

Against misty step, dimension door, or teleport, sure. But that's, what, 3 spells out of how many that could potentially be cast? The feat is not even close to being nearly worthless.

#1, the spell is cast. You can't try to stop it RAW. Unless it is concentration (less than half the spells, FWIW) and the caster sucks at CON saves--worthless.
#2, so, again if the spell is concentration (once more, less than half the spells), okay--otherwise worthless.
#3, if the caster is melee-oriented or DUMB enough to actually cast a SAVING THROW spell while within 5 feet of you, such it is nice. Otherwise--worthless.

I've only ever seen one player actually take this feat, and that was after we house-ruled it so you can use the reaction to attempt to stop the spell before it is cast.

So, yes, IMO, it is VERY close to being worthless RAW. YMMV, of course.

Now, improvements would be:

#1 allow the reaction to happen BEFORE the spell is completed. Now, it can affect every spell.
#3 make it advantage on saves AND disadvantage on the caster's attack roll. Now, it helps your defense in all cases.

Yeah though it's worth noting that interpretation is imho dumb as hell because it makes Mage Slayer almost completely worthless, and it's already and weak and very situational.

Nice to see I am not alone in realizing this.

 

[DND_Reborn]

I will also add that for a feat called "Mage Slayer", something like:

If you interrupt the caster's spell, the caster takes psychic damage equal to the spell's level.

would be cool.