Raven King, Help Me Out! Why Am I the Prince of the Crows?

Chen Shuang was just an unlucky guy who had gotten his hands on some newly purchased cosplay gear, when he was inexplicably transported to this damned place. He spawned right on top of a ghost's face and was beaten nearly to death. He decided that even if he died, he wasn't going to die looking this pathetic. He put on the helmet he'd bought to cosplay as a Space Marine and quietly began praying for divine help: Raven King, Lord of the Fire Dragons, Raven of Ill Omen... Anyone would do! The universe seemed to hear his plea and throw in a little something extra. When "AVE" rang out and the impatient face of the Raven Prince appeared before him, all manner of monsters and demons seemed to scatter. Wait, who was that person who could summon a big truck with a wave of their hand? And who were those guys in power armor? Warhammer x Foundation x infinite-instance adventures (?)