The duel structure with a partner on your side. Invite from the party panel and you queue onto the same team; queue alone and you get filled into one.
How it plays
FormatBest of 5 — two teams of two
RoundEnds when a whole enemy team is down
PartyPress G, invite from the lobby roster — your party lands on the same team
SoloQueue alone and you are filled into a team
ArenasThe full six-arena pool, same as the duel
Ranked is the only queue that records stats — casual arenas count for nothing, so nobody farms the board.