Ice Queen, called Counter Mastery before being unlocked, is a passive skill unique to Weiss Schnee in RWBY: Grimm Eclipse. It needs to be unlocked by successfully countering enemies 300 times, as Weiss. When used, it will freeze the enemy in addition to the damage. Costs 1 point to use.
As Boarbatusks cannot be frozen, countering them with this ability will not Stun them either, basically only dealing the damage and interrupting them.
Early Access[]
During Early Access, Ice Queen was called Master Blaster before being unlocked, and was unlocked by killing 20 enemies with the blast attack (done by performing a ranged attack during a melee combo). This skill upgrades Weiss' blast attack to freeze all enemies hit by the attack for 3 seconds.