Colossus Smash

Colossus Smash is a level 50 Arms warrior ability that deals damage and places a debuff on the target causing the warrior's attacks to deal 30% more damage for 10 seconds.

Tips and tactics
Colossus Smash is the most important arms warrior ability, bar none. Against heavily-armored targets like plate-wearers in PvP and raid bosses, the damage increase from this ability can be substantial. It is imperative that a good arms warrior keep Colossus Smash up almost all the time.

Colossus Smash has a 30 second cooldown and lasts 8 seconds, which is infrequent enough that choosing the right time to use it is very important. Colossus Smash should not be wasted on anything that will die quickly without posing much of a threat, such as AoE trash. In contrast, bosses should have Colossus Smash on them every second that it's possible to do so. Colossus Smash shines especially bright during the Execute phase of a raid boss fight.

Using Colossus Smash followed immediately by Bladestorm can deal a lot of damage. In general pooling rage and having cooldowns available for use during Colossus Smash is highly effective.

Trivia
Colossus Smash is one of Varian's Heroic Abilities in Heroes of the Storm. It also makes him hold his sword, Shalamayne, in two hands.