From Pathfinder Society Scenario #1-12: The Burden of Envy, which isn't enabled.

Barralbus (3-4)

CREATURE 5

UNIQUE MEDIUM EVIL HUMAN HUMANOID LAWFUL

Male Arcanist

Perception +9

Languages Common, Jotun, Thassilonian, Varisian

Skills Accounting Lore +11, Arcana +14, Society +11, Stealth +9, Thassilon Lore +11, Thievery +11

Str +0, Dex +3, Con +1, Int +5, Wis +2, Cha +1

Items Crossbow, Staff, Inkwell (bonded item), Spellbook, Invisibility Potion

AC 20; Fort +11, Ref +12, Will +14

HP 53

Counterspell (arcane)

Trigger A creature Casts a Spell Barralbus has prepared.

Effect Barralbus expends a prepared spell to counter the triggering creature's casting of the same spell. He loses the spell slot as if he had cast the triggering spell. He then attempts to counteract the triggering spell.

Speed 25 feet

Melee Staff +9 (two hand d8), Damage 1d4 bludgeoning

Melee Crossbow +9, Damage 1d8 piercing

Arcane Prepared Spells DC 22, attack +14; 3rd Haste, Invisibility Sphere, Magic Missile; 2nd Blur, Darkness, Flaming Sphere, Resist Energy; 1st Command, Grease, Gust of Wind, Magic Missile; Cantrips (3rd) Electric Arc, Mage Hand, Produce Flame, Ray of Frost, Sigil

Pathfinder Society Scenario #1-12: The Burden of EnvyOGL