Try a test of dispelling to end one ongoing magical effect, such as a buff or debuff caused by a spell.

Roll = d20 + academics + Dispel bonus

The DC to dispel a spell is:

8 + 4 if the caster has mastered the spell + twice the spell’s level

Some casters may have additional bonuses to the DC to counter their spells.
Certain abilities such as Intensify can boost the level of a spell.

If you pass, that magical effect ends.
If you fail, that magical effect is still suppressed until the start of your next turn,
unless it is undispellable, level 5 or above, or a curse.

Limitations:
This does not work on most enchanted gear or most magical artifacts (Such effects typically take much longer to disenchant using artifice), or undispellable spells.
Summoned creatures which are not composed of magic generally cannot be destroyed or unsummoned by this spell, but the connection to their master and the control that master wields over them may be compromised.

Held Counterspell:
You may also hold your action to cast Dispel on a spell as it is being cast to try to counter it or instantly negate it. When you cast Dispel in this way, it has the same effect as Counterspell, but costs your action to use and uses your Dispel bonus instead of your Counterspell bonus. If you fail your attempt to counter the spell, you cannot normally cast Dispel again to try again since Dispel takes an action to cast.

Suggested Backfire: You make the magic stronger, or trigger it.