Counter-attack IV is a level 4 active skill in AION Classic 1.9. The Ranger and the Assassin learn it from level 40.

Learned by

Class	Faction	Character level	Skill level
RangerAssassin	Both factions	40–48	1–9

Taught by

Item	Skill level
Counter-attack IVRanger, Lv 40
Counter-attack IVAssassin, Lv 40