I assume it is because they have lightning immunity, and the character that he described is using primarily lightning

You sure shield master doesnt work on fireball? The AC bonus to DEX save doesnt apply, but taking no damage on a succesful save should still apply, no?

DMs, would you consider adding rogues/assasins as enemies against spellcaster who spam fireball? Or like a group of dwarfs with shield master? On one hand, it will encourage more variety in a future, on the other the spellcaster would feel bad that he cant do much in such a fight and would probably get killed quickly.

It doesnt feel right “punishing” a spellcaster who uses fireball as a solution to all his problems like that, right?

Edit: and make them tieflings as well…oh god…poor fireballers

Well here is your chance. Argue this issues sensibly.

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