New answers tagged psionics
3
Not always, unless you permit metagaming at the table.
Most of the time, the character using Mage Slayer will see the effects of the spell, and this will be adequate for using their reaction granted by the feat.
Obviously, the issue comes down to when the effects of the spell are not obvious. Thankfully, the Player's Handbook and Xanathar's Guide to ...
8
Yes, the reaction is triggered by the casting of the spell
As you already mention in your question the feat does not require the player to see the spell being cast, and so by the rules, the player is allowed to take the reaction regardless of what type of spell is being cast.
I was not able to find any rulings that would contradict the rules as written in ...
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