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Blood Castle, Devil Square and Chaos Castle: how to enter and levels

OpenMU event guide (MU Online Season 6): level ranges for each Blood Castle, Devil Square and Chaos Castle, tickets, player count and duration.

Updated on Oct 3, 2026 Β· OpenMU server data

Events guide for MU Online Season 6: knight, elf and Dark Lord in front of Lorencia castle

Events are the best way to earn experience and items in MU Online. On OpenMU the Blood Castle, the Devil Square and the Chaos Castle are active. Each one has several versions, split by level range.

Special classes: Magic Gladiator, Dark Lord and Rage Fighter enter at lower levels ("MG / DL / RF" column).

Blood Castle

Break down the gate, destroy the statue and hand in the Archangel weapon. You enter with an Invisibility Cloak of the same level as the castle.

Castle Level MG / DL / RF Ticket
Blood Castle 1 15–80 10–60 Invisibility Cloak +1
Blood Castle 2 81–130 61–110 Invisibility Cloak +2
Blood Castle 3 131–180 111–160 Invisibility Cloak +3
Blood Castle 4 181–230 161–210 Invisibility Cloak +4
Blood Castle 5 231–280 211–260 Invisibility Cloak +5
Blood Castle 6 281–330 261–310 Invisibility Cloak +6
Blood Castle 7 331–400 311–400 Invisibility Cloak +7
Blood Castle 8 331–400 (master class) Invisibility Cloak +8 Β· master classes only
  • Up to 10 players, party allowed
  • Entry stays open for 1 minute, and the event lasts 20 minutes

Devil Square

Survive the waves of monsters and accumulate points. Entry is with a Devil's Invitation of the same level.

Arena Level MG / DL / RF Ticket
Devil Square 1 15–130 10–110 Devil's Invitation +1
Devil Square 2 131–180 111–160 Devil's Invitation +2
Devil Square 3 181–230 161–210 Devil's Invitation +3
Devil Square 4 231–280 211–260 Devil's Invitation +4
Devil Square 5 281–330 261–310 Devil's Invitation +5
Devil Square 6 331–400 311–400 Devil's Invitation +6
Devil Square 7 any any Devil's Invitation +7 Β· master classes only
  • Up to 10 players, party allowed
  • Entry stays open for 1 minute, and the event lasts 20 minutes

Chaos Castle

Free-for-all: no party, the last survivor takes the prize. Entry is with an Armor of Guardsman plus a zen fee.

Castle Level MG / DL / RF Entry fee
Chaos Castle 1 15–49 15–29 25,000 zen
Chaos Castle 2 50–119 30–99 80,000 zen
Chaos Castle 3 120–179 100–159 150,000 zen
Chaos Castle 4 180–239 160–219 250,000 zen
Chaos Castle 5 240–299 220–279 400,000 zen
Chaos Castle 6 300–400 280–400 650,000 zen
Chaos Castle 7 400 400 1,000,000 zen Β· master classes only
  • Up to 70 players, no party
  • Entry stays open for 5 minutes, and the event lasts 10 minutes

Tips

  • Watch your level: if you pass the range, you need the ticket for the next castle.
  • With 20x experience you change range quickly, so keep tickets for several levels.
  • Event times are announced in the game and in the news.
Blood Castle, Devil Square and Chaos Castle: how to enter and levels | OpenMU