MIR4 runs a separate clock for each region, so a boss that spawns at 23:00 on EU is not the same moment as 23:00 on ASIA. This guide lists the full MIR4 world boss schedule in server time, the daily reset for all five regions, and the one formula that turns any of it into your own local time.

MIR4 world bosses spawn at the same server time in every region: Krukan on Monday at 22:00, Nerkan on Tuesday at 23:00, Helbar on Wednesday at 23:00, Turkan on Thursday at 23:00 and Utukan on Friday at 22:00. The daily reset is the exception: one worldwide moment at 16:00 UTC.

Every time below comes from Mirkit's timing data, which follows Wemade's own notices and the in-game encyclopedia. Where an hour is community observed rather than published, it says so.

MIR4 server time by region

Wemade quotes every schedule "based on Regional Server Time". Each region sits on a fixed UTC offset:

• ASIA: UTC+8
• INMENA: UTC+6
• EU: UTC+2
• NA: UTC-4
• SA: UTC-3

These offsets never move. MIR4 does not follow daylight saving time, and Wemade's maintenance notices quote the same offsets in January and August. Keep that in mind for later, because your own clock may shift twice a year while the server's stays put.

What time is the MIR4 daily reset?

The MIR4 daily reset happens at 16:00 UTC on every region at once. On the server clocks that reads as 00:00 on ASIA, 22:00 on INMENA, 18:00 on EU, 13:00 on SA and 12:00 on NA.

This is where most of the confusion comes from. Bosses and dungeons repeat at the same server hour everywhere, but Wemade resets entry counts at a single instant, 16:00 UTC. The same instant lands on a different server hour in each region:

• ASIA (UTC+8): 00:00, the server's midnight
• INMENA (UTC+6): 22:00
• EU (UTC+2): 18:00
• SA (UTC-3): 13:00
• NA (UTC-4): 12:00

On ASIA the reset and the calendar day line up. On NA the new day for entry counts starts at noon, while the date on the server clock keeps running until midnight. If you clear dungeons late in your evening, that difference decides whether the run counts for today or tomorrow.

One thing not to mix up: Mirkit's own player rankings refresh separately, at an estimated 00:10 UTC+2 each day. That is when new power numbers land on the site, not a game reset.

MIR4 world boss schedule: the weekly bosses

Five named world bosses take one weeknight each. All times are server time for your region.

• Monday: Krukan at 22:00
• Tuesday: Nerkan appears sealed at 19:00 and becomes killable at 23:00
• Wednesday: Helbar at 23:00
• Thursday: Turkan appears sealed at 19:00 and becomes killable at 23:00
• Thursday: Rallying of Void at 23:00, open for 60 minutes
• Friday: Utukan at 22:00

Krukan and Utukan fight in areas with a player cap and no fast travel, so arriving on the spawn minute can mean the area is already full. Leave a few minutes early.

Nerkan and Turkan only spawn on a random set of servers each week, and the game posts an alert on the servers they land on.

Nerkan time in every region

Nerkan spawns sealed every Tuesday at 19:00 server time and becomes killable at 23:00. In UTC the killable moment is Tuesday 15:00 on ASIA, 17:00 on INMENA and 21:00 on EU, and Wednesday 02:00 on SA and 03:00 on NA.

• ASIA: Tuesday 23:00 server time, Tuesday 15:00 UTC
• INMENA: Tuesday 23:00 server time, Tuesday 17:00 UTC
• EU: Tuesday 23:00 server time, Tuesday 21:00 UTC
• SA: Tuesday 23:00 server time, Wednesday 02:00 UTC
• NA: Tuesday 23:00 server time, Wednesday 03:00 UTC

The four hours between 19:00 and 23:00 are the part to plan around. Nerkan is on the map but can't be damaged, so the hour worth an alarm is 23:00. Turkan follows the same pattern on Thursday, so the same UTC times apply two days later.

Thursday is the busiest night of the week: Attack of the Living Wraiths opens at 22:00, then Turkan and Rallying of Void both land at 23:00.

Daily world bosses

These spawn every day at the same server hour:

• Labyrinth Bosses: 10:00 and 20:00
• Hidden Valley Bosses: 12:00 and 22:00
• Redmoon Purgatory: 00:00, 06:00, 12:00 and 18:00, gone after 5 minutes

Redmoon Purgatory is the only boss on the schedule with an official despawn time, and five minutes is not much. For the others the game never published how long they stay, so treat the spawn hour as the start of a race rather than an open window.

Secret Peak and Magic Square times

The Secret Peak red bosses and the Magic Square chambers keep a fixed daily rhythm:

• Red Top Boss (Secret Peak): 04:00, 10:00, 16:00 and 22:00
• Red Bottom Boss (Secret Peak): 01:00, 07:00, 13:00 and 19:00
• Leaders Chamber III (Magic Square): every 3 hours from 00:00 to 21:00
• Fury Chamber (Magic Square): 05:00, 11:00, 17:00 and 23:00, open 60 minutes (community observed)
• Frenzy Chamber (Magic Square): 02:00, 08:00, 14:00 and 20:00, open 60 minutes (community observed)

Wemade has never published the Fury and Frenzy Chamber hours. Those two lines come from players watching the doors open, so read them as a steady pattern rather than a promise.

The other Secret Peak bosses respawn on a timer instead of a clock. Mirkit's /maps page runs those yourself: click a boss icon after a kill and it counts down 30 or 60 minutes, depending on the boss.

Server and clan events

• Domination: 09:00, 15:00 and 21:00, each round open 4 hours, one entry per day
• Expedition: daily at 21:00, open 4 hours
• Hidden Valley Capture: Wednesday at 22:00, 60 minutes
• Attack of the Living Wraiths: Thursday at 22:00, 60 minutes
• Bicheon Heist: Friday at 22:00, 60 minutes
• Clan Expedition: Saturday, open the whole server day
• Clan Challenge: Sunday, open the whole server day

Domination offers three rounds a day but lets you enter only one, so pick the round that fits your evening. Clan Expedition and Clan Challenge run when your clan calls them, which makes your clan's hour the one that counts.

How to convert MIR4 server time to your local time

It takes three steps: subtract your region's offset to get UTC, add your own offset, then check whether the day changed.

• Step 1: server time minus the region offset gives UTC. Nerkan on EU is 23:00 minus 2 hours, so 21:00 UTC.
• Step 2: UTC plus your local offset gives your time. In London in winter (UTC+0) that is 21:00, in New York in winter (UTC-5) it is 16:00.
• Step 3: check the day. An event late in the server's evening can fall on the next or previous calendar day for you.

Here is a full example. A player in Brazil (UTC-3) on an ASIA server sees Nerkan at 23:00 ASIA time. That is 15:00 UTC, which makes it 12:00 in Sao Paulo on Tuesday. A lunchtime boss.

Daylight saving is the trap. Because MIR4's offsets never change, every boss moves by one hour on your clock when your country changes its clocks. Play EU from Berlin and Nerkan is 22:00 local in winter (UTC+1) but 23:00 in summer (UTC+2). NA players on the US East Coast match server time only in summer; in winter, everything arrives an hour earlier on their clock.

Skip the maths with Mirkit's timing page

Mirkit's /timing page does all of this for you. Pick your region and every boss, dungeon and clan event becomes a live countdown. Live cards count down to the close of a window Wemade published, and Spawned cards count up from a boss that just appeared.

Two clocks sit at the top, the server's and yours. Switch to your own and every countdown and day heading moves to your time zone, daylight saving included. Turn on an alarm for any card and it rings once, at the lead time you pick.

Your settings stay in the browser with no account needed, and the region lives in the link: /timing?region=eu opens on EU for anyone you send it to, which is handy in a clan chat. Wemade has adjusted boss hours over the years and your in-game notice always wins, so if your server announces a different hour, you can move that card to it. The page is free, like most of Mirkit.