3-3 Ban Phase in the tournament lobby chat.
Players take turns banning 3 champions each in the Challengermode lobby chat starting with the left/top player. None of the 6 banned champions are allowed.
Step-by-step:
- The leftmost/top player gets to ban first.
- Ban by writing the name of the champion you wish to ban from the upcoming game.
- The next player does the same thing.
- Both now take turns banning one champion each until both have banned 3 each (for a total of 6).
- You can start the game together with your opponent.
Example:

Anyone that plays with a banned champion (as agreed in the Challengermode chat pre-game) may get disqualified. This means that neither of the players' banned champions can be played with (none of the 6 are allowed).
Only bans made in the Challengermode chat are valid. Written champion names are final.