The Idea of a PvP system in this game as i say on youtube was pretty good, but as alot of other ppl say it dose look kinda over powered. Well a quick way to fix that would be to set up the PvP Brackets baised on the Star lvl of your eqps. For Example their would be 1-5 lvls of pvp plus a 6th for a unranked pvp bracket

1★-Squire's (all eqps must be 1★)
2★-Beginner Knight's (all eqps must be 2★)
3★-Knight's (all eqps must be 3★)
4★-Spiral Knight's (all eqps must be 4★)
5★-Hero's (all eqps must be 5★)
(6th Bracket for unranked so any star lvl could go in if they chose to)

That would be a good way of having the PvP set up so their wouldnt bo to much confusion amongst the power/lvl. As far as game modes go in PvP jus having a DeathMatch style would get kind of boring so incorprating, more a Capture the gems. (seeing as the whole gem thing is already a big part of the game). It could maybe have one team vs another (4v4 or 6v6 if its not to big) where they objective is to collect the gems and bring them back to your lift, or having one whole big gem and the team that occupies the gem gets points over the duration of the time to win (this should be a 6v6 operation because team work would be key). Well thats all my thoughts for now leave your opinios if u think anything would be great or not
(plz remeber these r jus my thoughts dnt b to rash lol) hope we see some pvp in this game later on, :)