Arca Battle

Every Wednesday at 22:00, guilds fight for the three obelisks of Acheron and Debenter. A guild that owns an obelisk gets +20% monster EXP for the whole week.

Arca Battle arrived on October 9, 2026, from MU Season 9. It is a war between guilds.

When#

Every Wednesday at 22:00 (Brasília time). The battle lasts 30 minutes.

Registration opens 30 minutes before. It is in the Events → Arca Battle menu, or use the /arca command.

Registration#

1. The guild master or an officer registers the guild. It needs at least 5 members, and up to 8 guilds can join.
2. Then each member clicks Join the battle. You need total level 350 (level + Master Level).
3. If the guild is already registered, a member can join while the battle is running: they go straight to Acheron.

If fewer than 2 guilds have someone inside when it starts, the battle is cancelled.

The battle#

At the set time, everyone who joined goes to Acheron, each guild through its own entrance. There are three obelisks:

• Alkmaar, in Acheron (89, 41);
• Ubaid, in Acheron (188, 101);
• Debenter, on the Debenter map (162, 54).

Each obelisk has 500,000 HP and guardians around it: cursed elementals that come back every 10 minutes.

The three auras#

Around each obelisk there are three auras. To damage the obelisk, your guild needs one member standing on each of the three.

If two guilds hold all three auras at the same time, nobody can damage the obelisk. Push the rivals out first.

Taking an obelisk#

Whoever lands the last hit on the obelisk takes it for their guild. The obelisk comes back 20 seconds later with 300,000 HP, and other guilds can take it.

The owner guild cannot damage its own obelisk.

PvP#

During the battle, members of different registered guilds can attack each other without becoming PK. There is no damage within the same guild, and anyone who is not registered stays out of the fight.

If you die, you go back to your guild's entrance.

Rewards#

When the 30 minutes are over, everyone inside receives in the Gremory:

A guild that owns at least one obelisk gets +20% monster EXP for every member until next Wednesday.

Tips#

• Bring people to hold the auras and people to hit the obelisk. Whoever stands on an aura does not need to attack.
• Taking an obelisk in the last minute counts as much as taking it early: only the owner at the end counts.
• Arca Battle never falls on the same day as Acheron Guardian: that event does not open on Wednesdays.