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.

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!

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

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Upcoming MU Online Events

Events are sorted by the next start time. Times below are shown in your selected timezone.

Blood Castle All realms

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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 →

Arca War MuOnline-AI

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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 obelisks and earn rewards.
View Arca War schedule & guide →

Arca War SilverMU

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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 obelisks and earn rewards.
View Arca War schedule & guide →

Arca War VoltMU

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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 obelisks and earn rewards.
View Arca War schedule & guide →

Arca War FuryMU

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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 obelisks and earn rewards.
View Arca War schedule & guide →

Arca War RichMU

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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 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 must protect the Wolf Statue and altars against Balgass.
Open Crywolf guide →

Ice Wind Valley VoltMU

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Registration opens: --
Start --
End --

View full schedule

Schedule (UTC): Daily – starts at 14:30 (60 min), registration 14:25 (+5 min)
Guild masters can type /regicewind during the registration period to register their guild.
Open Icewind Valley guide →

Ice Wind Valley FuryMU

--:--:--

Registration opens: --
Start --
End --

View full schedule

Schedule (UTC): Daily – starts at 14:30 (60 min), registration 14:25 (+5 min)
Guild masters can type /regicewind during the registration period to register their guild.
Open Icewind Valley guide →

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 event where players fight monsters and each other on a collapsing arena.
Open Chaos Castle guide →

Castle Siege VoltMU

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Registration opens: --
Start --
End --

View full schedule

Guild registration (UTC): Sun 2025-11-23 00:00 --:--:--
Register Mark of the Lord (UTC): Thu 2025-11-27 00:00 --:--:--
Attack guild notification (UTC): Fri 2025-11-28 00:00 --:--:--
Ready for Castle Siege (UTC): Fri 2025-11-28 23:00 --:--:--
Castle Siege start (UTC): Sat 2025-11-29 17:00 --:--:--
Castle Siege end (UTC): Sat 2025-11-29 18:00 --:--:--
End of Castle Siege cycle (UTC): Sun 2025-11-30 00:00 --:--:--
Castle Siege is a weekly guild vs guild battle for control of the castle.
Open Castle Siege guide →

Castle Siege SilverMU

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Registration opens: --
Start --
End --

View full schedule

Guild registration (UTC): Sun 2025-11-23 00:00 --:--:--
Register Mark of the Lord (UTC): Thu 2025-11-27 00:00 --:--:--
Attack guild notification (UTC): Fri 2025-11-28 00:00 --:--:--
Ready for Castle Siege (UTC): Fri 2025-11-28 19:00 --:--:--
Castle Siege start (UTC): Sat 2025-11-29 18:00 --:--:--
Castle Siege end (UTC): Sat 2025-11-29 19:00 --:--:--
End of Castle Siege cycle (UTC): Sun 2025-11-30 00:00 --:--:--
Castle Siege is a weekly guild vs guild battle for control of the castle.
Open Castle Siege guide →

Ice Wind Valley RichMU

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Registration opens: --
Start --
End --

View full schedule

Schedule (UTC): Daily – starts at 18:30 (60 min), registration 18:25 (+5 min)
Guild masters can type /regicewind during the registration period to register their guild.
Open Icewind Valley guide →

Ice Wind Valley SilverMU

--:--:--

Registration opens: --
Start --
End --

View full schedule

Schedule (UTC): Daily – starts at 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 →

Ice Wind Valley MuOnline-AI

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Registration opens: --
Start --
End --

View full schedule

Schedule (UTC): Daily – starts at 00:30 (60 min), registration 00:25 (+5 min)
Guild masters can type /regicewind during the registration period to register their guild.
Open Icewind Valley guide →

Castle Siege MuOnline-AI

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Registration opens: --
Start --
End --

View full schedule

Guild registration (UTC): Sun 2025-11-30 00:00 --:--:--
Register Mark of the Lord (UTC): Thu 2025-12-04 00:00 --:--:--
Attack guild notification (UTC): Fri 2025-12-05 00:00 --:--:--
Ready for Castle Siege (UTC): Fri 2025-12-05 12:00 --:--:--
Castle Siege start (UTC): Sat 2025-12-06 01:00 --:--:--
Castle Siege end (UTC): Sat 2025-12-06 02:00 --:--:--
End of Castle Siege cycle (UTC): Sun 2025-12-07 00:00 --:--:--
Castle Siege is a weekly guild vs guild battle for control of the castle.
Open Castle Siege guide →

Castle Siege RichMU

--:--:--

Registration opens: --
Start --
End --

View full schedule

Guild registration (UTC): Sun 2025-11-30 00:00 --:--:--
Register Mark of the Lord (UTC): Thu 2025-12-04 00:00 --:--:--
Attack guild notification (UTC): Fri 2025-12-05 00:00 --:--:--
Ready for Castle Siege (UTC): Fri 2025-12-05 23:00 --:--:--
Castle Siege start (UTC): Sat 2025-12-06 05:00 --:--:--
Castle Siege end (UTC): Sat 2025-12-06 06:00 --:--:--
End of Castle Siege cycle (UTC): Sun 2025-12-07 00:00 --:--:--
Castle Siege is a weekly guild vs guild battle for control of the castle.
Open Castle Siege guide →

Castle Siege FuryMU

--:--:--

Registration opens: --
Start --
End --

View full schedule

Guild registration (UTC): Sun 2025-11-30 00:00 --:--:--
Register Mark of the Lord (UTC): Thu 2025-12-04 00:00 --:--:--
Attack guild notification (UTC): Fri 2025-12-05 00:00 --:--:--
Ready for Castle Siege (UTC): Fri 2025-12-05 23:00 --:--:--
Castle Siege start (UTC): Sat 2025-12-06 11:00 --:--:--
Castle Siege end (UTC): Sat 2025-12-06 12:00 --:--:--
End of Castle Siege cycle (UTC): Sun 2025-12-07 00:00 --:--:--
Castle Siege is a weekly guild vs guild battle for control of the castle.
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-AI	SilverMU	VoltMU	FuryMU	RichMU
Blood Castle	--:--:--	--:--:--	--:--:--	--:--:--	--:--:--
Arca War	--:--:--	--:--:--	--:--:--	--:--:--	--:--:--
Crywolf	--:--:--	--:--:--	--:--:--	--:--:--	--:--:--
Ice Wind Valley	--:--:--	--:--:--	--:--:--	--:--:--	--:--:--
Chaos Castle	--:--:--	--:--:--	--:--:--	--:--:--	--:--:--
Castle Siege	--:--:--	--:--:--	--:--:--	--:--:--	--:--:--

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

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.