Back in my day, we'd go several sessions without a rest which really did wonders to tone down spellcasting nova.
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
In a world full of magic, at a certain level casters with Counter spell will be necessary for the survival of certain groups. It's just logical
Shield master doesn't work against fireballs, it only works against single-target spells.
As for tieflings... well, a wizard with the elemental adept feat can just ignore fire resistance (and ensures that the minimum damage on the fireball is bumped to 16). Or a Scribes wizard can just have Spirit Shroud in their spellbook, cast necroball, and be done with it. Or a sorcerer with transmuted spell can use another elemental type too, though for them it costs SPs.
FIREBA...
