Sources of power

Instead, he clenched his fists, channeling his pain and frustration into a fierce resolve. Each ache, each throb of agony, became fuel for his determination, reminding him of the stakes and the sacrifices that had brought him to this point. Through gritted teeth, he vowed to press on, to face whatever trials awaited him with unwavering resolve.

"Anyway, what is the situation?" Ethan asked. "Did we make any progress on learning what is the cause of all this mess?" 

"I have some people looking into it, but we are short-handed, thanks to the dungeons and rifts," John replied. "Our allies in other worlds are also doing some research, but they have never heard of such a thing… where enemies from the past returned from the dead like nothing had happened."