PvP is an abbreviation for Player versus Player and is made out of all game modes that allow players to interact and compete against other players, with the goal of ranking better in a ranking ladder, let it be real time or computer-driven.
All PvP grounds experience a ATK debuff which is casted upon all enemies and allies in the battlefield.
The debuff reduces the ATK by 80%, gradually decreasing over the course of the battle. A message that says "Begin Rage Mode; damage decreases every 30 sec" will announce that.
PvP is separated into two leagues.
The Buster league, where players are allowed to use their Key Units for competition.
And the Hero league, where no Keys are allowed.
Whether one has Key Units or not, they will always be allowed to participate in both of them. A weekly reward of 50 rubies will be granted for those who do.
Players will be granted rewards for both leagues.