Counterspell (Sorcerer) Feat 1
Source Pathfinder Advanced Player's Guide
Trigger A creature casts a spell that you have in your repertoire.
Requirements You have an unexpended spell slot you could use to cast the triggering spell.
When a foe Casts a Spell you know and you can see its manifestations, you can use your own magic to disrupt it. You expend one of your spell slots to counter the triggering creature's casting of a spell that you have in your repertoire. You lose your spell slot as if you had cast the triggering spell. You then attempt to counteract the triggering spell.
Special This feat has the trait corresponding to the tradition of spells you cast (arcane, divine, natural, or occult).
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AbjurationEffects and magic items with this trait are associated with the abjuration school of magic, typically involving protection or wards.
SorcererThis indicates abilities from the sorcerer class.