Players can duel one another with consent in any area. The victor of a duel earns PvP points; however, there is currently no known use for the points. A player defeated in a duel reincarnates on the spot with minimal health and mana.

Fights with consent (player killing) can only be performed in areas outside a safety zone. In such cases, players enter a battle status, during which the names of the fighting players turn purple. In this mode, players do not gain PvP points through victory. The victor of a non-consensual fight may gain PK and Inclination Points (IP), if the attacked player did not fight back. If the attacked player fights back, the attacker will not gain IP or PK points. The defeated player, when killed, must respawn from a set return point. Inclination Points decrease over time or when being killed. Players with IP can be attacked and killed outside safety zones without consequences for the attacker. Furthermore, they may not use shops or the teleportation system, will be sent to jail if they have collected over 500 IP and get killed, and may be attacked by NPC guards. When in jail, time may be paid off with bribes.

2Moons includes a 'Attack' system, which can only be utilized in Player Versus Player combat. The shield activates only against an attack launched by another player, and it acts as additional protection and regenerates steadily after combat. Its strength is based on the armour rating, health, and level of the player. The shield prevents quick killing of weakened players, giving them a chance to run away from battle.