Counterspelling

Any character who is capable of casting spells can attempt to counteract a spell, either as it is being cast, or an ongoing spell effect (for example, a Grease spell cast by an enemy caster a number of rounds beforehand).

To counterspell, the character must take an Immediate Action, spend Mana equal to the Tier of the spell being countered, and make a Caster Level check. The DC for the check is equal to 11 + the level of the spell being cast. If the character's caster level check is equal to or higher than the DC, the spell is counteracted and has no effect. If the character's caster level check is lower than the DC, the spell is not counteracted and takes effect as normal.

If multiple characters attempt to counterspell the same effect, the character with the highest caster level check succeeds. If there is a tie, the character with the highest ability score modifier for their relevant spellcasting ability succeeds.

Characters may increase their proficiency with Counterspelling by selecting the Counterspell and Improved Counterspell Feats. Additionally, counterspelling effectiveness may be increased by two means:

1. Dispel Magic: As part of the normal Mana expenditure and action involved in Counterspelling, a spellcaster may cast Dispel Magic to receive an untyped +10 bonus to their Caster Level check to dispel. For example, if you wish to counter a Fireball as it is being cast, you must know Dispel Magic to use this option, and spend 6 Mana (3 against the T3 spell, 3 for Dispel Magic), to roll your Caster Level check at a +10 bonus.
2. True Counter: As part of the normal Mana expenditure and action involved in Counterspelling, a spellcaster may cast the same spell, expending the Mana for it as well, to automatically succeed on the Caster Level check. You must know the spell being countered to perform this option.