I think the exiled cheating magician is enjoying a carefree second life. It's basically him saying "I can grant “reinforcement points” not only to weapons, but to anything, and I can revoke the effects at any time I choose. But are those left behind okay?"
currently the thugs don't act on rain cause the Royal army is investigating blue crystal, so the overarching plot is on stalemate. on the other hand, rain is just living his everyday life (meeting people and taking care of donguri), and so has the free time to just do odd jobs
Reading this reminds me when I was at school, I was this retarded and so were all my friends, this is the kind of shit I could see us doing back then lmao