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Mastering Magic / Spell Duels

Duel Counter

Source Ultimate Magic pg. 100
Each participant in a duel can take a special action once per round called a dueling counter. A dueling counter is similar to a counterspell, but is easier to use.

When a dueling opponent tries to cast a spell, the targeted spellcaster can make a Spellcraft check (DC 15 + the spell’s level) as a free action. If the check succeeds, she identifies her opponent’s spell and can attempt a dueling counter. If it fails, she cannot attempt a dueling counter against that spell.

A dueling counter is an immediate action that does not provoke attacks of opportunity. To attempt a dueling counter, the countering duelist must expend a spell or a spell slot of a level equal to or higher than that of the spell being cast. Note that characters who cast spells spontaneously (such as bards and sorcerers) must choose what exact spell they are using to counterspell in addition to the slot being used. The countering duelist must then make a caster level check against a DC of 15 + the spell’s caster level. Unlike when using a true counterspell action (which requires a readied action), even expending an exact copy of the spell being cast does not guarantee success. The caster attempting the counterspell receives a bonus or penalty on her check depending upon the level of the spell slot expended and the exact spell used, as noted in Table 2–3. If the check is successful, the spell is countered—it is negated and the spell is lost. If not, the spell happens as normal and the duelist attempting to counter the spell takes a –2 penalty on any saving throws made against the spell’s effect.

Alternatively, a spellcaster can use dispel magic or dispel magic, greater as a dueling counter. When a dueling spellcaster does so, she does not need to identify the spell being cast, can counter a spell of any level, and must succeed at a caster level check against a DC of 11 + the spell’s caster level. When dispel magic is used as a dueling counter, it is not modified by any of the circumstances in Table 2–3.

Because readying to counterspell is its own action, a participant can choose to ready to counterspell and make a dueling counter in the same round. This is only useful if the participant is facing multiple opponents or someone with access to Quickened Spell or other abilities that allow casting two spells in the same round.
CircumstanceCheck Modifier
Spell is of a different school-2
Spell is of the same school, but not the same spell+2
Spell is a higher level than the spell being countered+1 per level higher
Spell is the same as the spell being countered+10