alright since there are specific elemental themed spells in this game and there's no way to give monsters specific weaknesses, why not have a spell with a bunch of triggers that lasts for 100+ turns and nullifies every single elemental spell EXCEPT ones that the monster is elementally weak against? obviously it should be used on caster with 100% cast rate, and a mana cost high enough that it isn't used over and over again. not sure if this would completely eliminate spells monsters nullify or reduce them to one turn, but it would severely weaken their impact regardless.
boss monsters could even switch around their weaknesses multiple times during a battle, forcing players to adapt
boss monsters could even switch around their weaknesses multiple times during a battle, forcing players to adapt

