Cast your WoW spells as Kliff while Crimson Desert fights underneath.
You play as Kliff in Crimson Desert Enhanced. A spell bar sits on the fight. Keys 1 to 4 cast spells read from your own World of Warcraft install: the names, cooldowns, costs, and how hard they hit come from that copy when you press Play. Kliff's class and spec are the newest character saved there.
Bulwark holds the foe, Grace keeps everyone up, and Aether adds damage. They are companions in the fight, not other players. One person plays.
Burn the foe's bar to zero and the exchange is won. If every health bar falls, the exchange is lost. That bar is the mashup's exchange for the enemy in front of Kliff. Crimson Desert keeps its own fight.
Nothing from either game is in the download. CascLib by Ladislav Zezula is MIT. zlib 1.2.11 by Jean-loup Gailly and Mark Adler ships with it.