Codex text
Each class has a special status effect that can set up a cross-class combo, in which a character of one class uses a talent or spell to hinder an enemy with the effect before a character of another class exploits it using another talent or spell. This produces a tremendously powerful attack.
Each of the status effects that enable a cross-class combo also applies a penalty to the victim. If the cross-class combo is completed successfully, the effect and its penalty dissipate, but the great damage inflicted by a cross-class combo more than makes up for this loss.
Staggered!
Warriors can stagger enemies using any of several upgraded talents from the Vanguard and Warmonger schools.
Mages can exploit stagger using upgraded spells from the Arcane or Primal schools, or rogues can do so using upgraded talents from the Dual Weapon school.
Enemy attack: -25%
Enemy defense: -25%
Disoriented!
Rogues can disorient enemies using any of several upgraded talents from the Sabotage, Scoundrel, and Archery schools.
Warriors can exploit disorient using upgraded talents from the Weapon and Shield school, or mages can do so using upgraded spells from the Spirit school.
Enemy defense: -50%
Brittle!
Mages can make enemies brittle using any of several upgraded spells from the Primal and Elemental schools.
Warriors can exploit brittle using upgraded talents from the Two-Handed school, or rogues can do so using upgraded talents from the Archery school.
Critical damage: +50%