You attempt to interrupt a creature in the process of casting a spell.
The target spell must have a casting time of 1 action.
You may cast this spell at higher levels by expending the appropriate spell slot.
You and the target spell's caster make a contested spellcasting ability check each adding an amount equal to the level each spell was cast at plus any bonus granted from Acane Familiarity see below.
You succeed if your score exceeds the target spells' caster's
On a failure, the target caster's spell succeeds and takes effect as normal.
On a success, the target caster's spell fails and has no effect.
Arcane Familiarity (+1 Per condition)
You have a greater understanding of the target spell or the caster, add a +1 to your spellcasting ability check for each of the following conditions you meet.
You have learned the spell being cast.
You are within 10ft of the caster.
You are the target of the spell or are within its area of effect.
Quicken Spell
A creature may use the effects of the metamagic effect "Quicken Spell" to allow themselves to target spells with any casting time.
Example
A Wizard casts fireball at 3rd level and you, a Sorcerer cast Countercurse at 3rd Level.
You each roll a D20, Wizard scores a 12
The Wizard adds their intelligence modifier, +3 and their proficiency bonus +3
The Wizard then adds +3 because they are casting Fireball at third level.
12+3+3+3 = 21
You rolled a 10
You, being a sorcerer in this example add your Charisma modifier +4 and your proficiency bonus +3
You add +3 because you are casting Countercurse at third level
You add +1 because you are in the area effect of the Fireball
You add +1 because you know Fireball
Unfortunately you are more than 10ft. away so you don't get that bonus
10+4+3+3+1+1 = 22
You scored higher than the opposing caster and therefore succeed, their spell has no effect.
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