Alright so I'm sure a lot of people are going to complain that there's an energy system, but there are times when devs make an energy system that's not purposely trying to steal your money and this game happens to be one of them imho. Now, I'm no fan of energy systems but I absolutely hate the ones that take 5+ minutes to recharge a single energy; this game is 2mins per energy and your energy cap scales with your level. FoG's fuse system is actually really nicely done, e.g. the exp that you get for using a tier I is 1,875, 10.5k for tier II, and 50% bonus exp if the fusion material is the same type as the ally being lvled, i.e. Human to Human, etc. As for the PvP aspect, it seems pretty well balanced, i.e. I haven't been put up against anyone out of my lvl range. All in all FoG has real potential imho, as even the premium summon option isn't ridiculously expensive and as I stated earlier, it's not overly difficult to evolve your allies meaning free players aren't getting screwed over.