Item duping. The few times it's acceptable is when it's done as part of a speedrun of a single-player game. Or just in a single-player game. In an MMO this would earn condemnation from the players, bans from game masters and perhaps a rollback of the server for destroying the in-game economy.
If this is modeled from more recent games, microtransactions and PTW would be a thing, and I guess OP cash shop items are going to be the target of all that money.
Knowing Daanya is just Eida under magical transformation makes all her shenanigans extra fun to see. Just imagine the supposedly dignified royal Eida herself biting his head.