15 is too much. I don't want it to be so you guys can just literally always beat the mobs. It needs to be a challenge to an extent. I'll increase it, but not that much.
Also, I know some people have been complaining about two things: Not being free and needing too many people. I killed two birds with one stone. "Ruins" (Ruins of Alph) is both free and needs a min of 0 people. To counteract this, it has less rewards, less waves, and has a small max. It's a pretty small arena but if new people want to givei t a try, they can go here while people who want an actual challenge can do the actual ones. Or cheapskates. Whichever.