Clash Challenge (Clash Battle) is a mini-game that you can play with other Avatars and NPCs. All you need is a complete deck of Cards that has 5 Cards in it.
Once engaged in a Battle, you are always represented by Blue color. Your opponent is always Red. (Same applies to your adversary—you are Red for your opponent.)
The winner takes a Card from the opponent’s deck along with some Shards and valuables, given winner’s S.A.M.P.L.E. stats looks better than of the opponent.
Each Avatar can run away given their Luck and S.A.M.P.L.E. are high enough.