Rage is the sole ability that Swordwrath posess.
Rage causes Swordwrath to glow red, at a cost of a fraction of their max health. Swordwrath with less than half a bar of health will be unable to activate rage.
While the Swordwrath are glowing red, their movement speed drastically increases, as does their attack damage and attacking rate.
Due to the sheer power this ability provides, Swordwrath become a viable late-game unit. They are turned into glass cannons, in the sense that they are very vulnerable but can output large amounts of damage.