Kick

Kick is a level 18 rogue ability that interrupts spellcasting. If Kick interrupts a spell, it also prevents the target from casting any spell from that school for 5 seconds.

Tips and tactics
Properly staggering the cooldowns of Kick, Kidney Shot, and Gouge can keep a caster almost completely crippled for the duration of a battle.

See Interrupt for information and tactics on using interrupts such as Kick.