MU Online Events and Schedule

Find upcoming MU Online events, start times, and information about the players and guilds who joined each event. Track Castle Siege, Icewind Castle, Arca Battle and more!

  • All times are stored in server time (UTC) and converted to your local timezone.
  • Use the filters to focus on a single event type such as Blood Castle, Castle Siege or Boss Battle Together.
  • Cards stack in order of the next start, with live and registering events highlighted automatically.

See MU Online event times in your timezone

Event start times are stored in UTC (server time). Choose your continent and country to convert them.

Current time in selected zone:
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Upcoming MU Online Events

Events are sorted by the next start time. Cards below are shown in your selected timezone, with live and registering events highlighted.

Event type
Realm
Ice Wind Valley Muonline-X
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  • Registration opens: --
  • Start --
  • End --
View full schedule
  • Sunday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Sunday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Monday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Monday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Tuesday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Tuesday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Wednesday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Wednesday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Thursday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Thursday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Friday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Friday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Saturday (UTC): Starts 07:30 (60 min), registration 07:25 (+5 min)
  • Saturday (UTC): Starts 19:30 (60 min), registration 19:25 (+5 min)
  • Guild masters can type /regicewind during the registration period to register their guild.
    Open Icewind Valley guide →
Arca War Muonline-X
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  • Start --
  • End --
View full schedule
  • Monday (UTC): 00:00, 08:00, 14:00, 20:00
  • Wednesday (UTC): 00:00, 08:00, 14:00, 20:00
  • Friday (UTC): 00:00, 08:00, 14:00, 20:00
  • Saturday (UTC): 00:00, 08:00, 14:00, 20:00
  • Arca War runs several times per week across Alkmaar, Ubaid and Debenter. Guilds compete to control elemental obelisks and earn rewards.
    View Arca War schedule & guide →
Crywolf All realms
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  • Start --
View full schedule
  • Invasion times (UTC): 02:10, 05:10, 08:10, 11:10, 14:10, 17:10, 20:10, 23:10
  • Crywolf is a fortress defense event where players protect the Wolf Statue and altars against Balgass.
    Open Crywolf guide →
Boss Battle Together All realms
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  • Start --
  • End --
View full schedule
  • Every day start: Daily 20:15 (server time / UTC) --:--:--
  • Every day start: Daily 00:15 (server time / UTC) --:--:--
  • Every day start: Daily 04:15 (server time / UTC) --:--:--
  • Every day start: Daily 08:15 (server time / UTC) --:--:--
  • Every day start: Daily 12:15 (server time / UTC) --:--:--
  • Every day start: Daily 16:15 (server time / UTC) --:--:--
  • Boss Battle Together is a cross–realm co‑op boss fight where parties work together to defeat powerful raid bosses for high‑end loot.
    Learn more about Boss Battle Together →
Chaos Castle All realms
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  • Registration opens: --
  • Start --
  • End --
View full schedule
  • Gate open times: 01:00, 15:00, 17:00, 19:00, 21:00, 23:00
  • Event start: Starts 5 min after gate opens
  • Duration: 15 min
  • Chaos Castle is a survival arena where players fight monsters and each other on a collapsing platform.
    Open Chaos Castle guide →
Blood Castle All realms
--:--:--
  • Registration opens: --
  • Start --
  • End --
View full schedule
  • Daily times (UTC): 00:10, 00:40, 01:10, 01:40, 02:10, 02:40, 03:10, 03:40, 05:10, 07:10, 09:10, 11:10, 13:10, 15:10, 17:10, 19:10, 21:10, 21:40, 22:10, 22:40, 23:10, 23:40
  • Registration: Opens 5 min before each start time
  • Duration: 15 min
  • Blood Castle registration opens 5 minutes before each start and closes when the event begins.
    Open Blood Castle guide →
Castle Siege Muonline-X
--:--:--
  • Registration opens: --
  • Start --
  • End --
View full schedule
  • Guild registration (UTC): Sun 2026-04-26 16:00 --:--:--
  • Register Mark of the Lord (UTC): Thu 2026-04-30 00:00 --:--:--
  • Attack guild notification (UTC): Fri 2026-05-01 00:00 --:--:--
  • Ready for Castle Siege (UTC): Fri 2026-05-01 23:00 --:--:--
  • Castle Siege start (UTC): Sat 2026-05-02 21:00 --:--:--
  • Castle Siege end (UTC): Sat 2026-05-02 22:00 --:--:--
  • End of Castle Siege cycle (UTC): Sun 2026-05-03 16:00 --:--:--
  • Castle Siege is a weekly guild vs guild battle for control of the castle and access to Land of Trials.
    Open Castle Siege guide →

Global registration overview

Quick overview of the next registration openings for each event across all realms (server time / UTC).

Event Muonline-X
Ice Wind Valley --:--:--
Arca War --:--:--
Crywolf --:--:--
Boss Battle Together --:--:--
Chaos Castle --:--:--
Blood Castle --:--:--
Castle Siege --:--:--

Registration times are shown in server time (UTC). Use the converter above to see them in your local time.

Next event
Ice Wind Valley Muonline-X
Starts in --:--:--
Server (UTC) start: Wed, 2026-04-29 19:30 UTC

MU Online event overview

MU Online events are timed activities like Blood Castle, Devil Square, Chaos Castle, Crywolf, Castle Siege, Arca War and Boss Battle Together that reward excellent experience, Jewels, socket items and other end‑game gear when you join consistently and perform well.

Core instanced events

  • Blood Castle – race across a bridge, break the gate, defeat monsters and recover the Archangel’s weapon for big EXP and Jewel rewards.
  • Devil Square – a wave‑based survival arena where you farm dense monster packs for experience and drops within a limited time.
  • Chaos Castle – PvE / PvP hybrid arena on a shrinking platform; stay alive longer than other players while monsters push everyone into the void.

World & guild events

  • Crywolf Fortress – defend the Wolf Statue and its altars from Balgass; success buffs the whole server, failure empowers Kundun and his armies.
  • Castle Siege – weekly guild vs guild siege for control of the castle and access to Land of Trials, tax income and prestige.
  • Arca War – competitive guild war across Alkmaar, Ubaid and Debenter, capturing and defending elemental obelisks for tokens and bonuses.
  • Boss Battle Together – co‑op raid where parties from across the server team up to defeat powerful bosses for late‑game loot and enhancement materials.

Tips for using the event schedule

  • Pick two or three events that match your playtime (for example Blood Castle + Devil Square + Arca War) and follow their timers in this schedule.
  • Use the realm and type filters to quickly check what is running tonight on your main realm.
  • Watch the “Currently active events” bar at the top of the list to jump into live content as soon as you log in.
  • Plan Castle Siege, Arca War and Boss Battle Together around your guild so that everyone is online and prepared when registration opens.

MU Online Events FAQ

What events can I join in MU Online?
Major MU Online events include Castle Siege, Icewind Castle, Arca Battle, and more. Each event offers unique rewards for guilds and players who participate.
How do I join Castle Siege or Icewind Valley in MU Online?
To join Castle Siege or Icewind Valley in MU Online, join a strong guild and participate during the scheduled event time shown above.
Where can I see MU Online event times?
You can always check MU Online event schedules on this page for the latest information on Castle Siege, Icewind Castle, and other events.