Custom party's//solo play//level sync

[ChameleonMS]

Welcome to the game.
1. Yes but you cannot do it until you are a much higher level (not completely sure about this requirement).
You register for the dungeon and set your dungeon configuration to Undersized Party. You must have cleared dungeon before hand. While unsynced you cannot loot chests or gain XP.
3.0 Patch Notes search for Undersized Party.

2. Form the party before registering for the duty. No, you cannot exceed the maximum number of players for the specific duty.

3. See #1.