World Boss MIR4 Guide: Weekly Rotation, Sealed Spawns & Times

What are MIR4 world bosses?

World bosses are high-value weekly monsters that reward Darksteel, high-grade materials, and contribution ranking among everyone who deals damage. Unlike Secret Peak field bosses or Magic Square farming mobs, world bosses run on a fixed weekly rotation: one specific boss per day, Monday through Friday, each up for roughly one hour.

Two of them, Nerkan and Turkan, use a sealed spawn mechanic. They appear on the map at 19:00 server time but spawn sealed (invulnerable) — you cannot damage them until 23:00. Arriving at 19:00 expecting a fight is the single most common mistake with these two. Show up at 23:00, not 19:00.

• Turkan is located in Violet Abaddon, reached through the portal on Phantasia Valley 4F.
• Helbar is located in Redmoon Purgatory 7F.

Damage-based contribution means you do not need the killing blow to earn rewards — but higher damage climbs the ranking and pays out more. Bring your best gear and burst.

Full weekly world boss rotation (server time)

Here is the complete weekly schedule. The Attackable column is the hour the boss can actually be damaged — for sealed bosses this is not the same as the spawn time. All times are MIR4 server time; use RaidHours to convert them to your zone automatically.

Key takeaway: Nerkan (Tue) and Turkan (Thu) are the sealed pair — they show up at 19:00 but stay locked until 23:00. Krukan and Utukan open earlier at 22:00, while Helbar joins the 23:00 crowd on Wednesday. These times can shift after the weekly maintenance, so always double-check in-game before committing your evening to a raid.

How to participate and maximize rewards

Getting a world boss kill counted toward your rewards comes down to being in the right place before the window opens and dealing meaningful damage. A quick checklist:

• Travel early, but know the unlock hour. For sealed bosses (Nerkan, Turkan) enter the zone before 23:00, not at the 19:00 spawn. Getting into Violet Abaddon means using the portal on Phantasia Valley 4F; Helbar requires descending to Redmoon Purgatory 7F.
• Bring burst, not endurance. Windows are short (~1 hour) and the boss is heavily contested. Front-load your damage with potions, buffs, and cooldowns ready the moment it becomes attackable.
• Party up. Grouping with clanmates concentrates damage and helps everyone secure a contribution tier before the boss dies.
• Watch the clock in your own timezone. Server time is meaningless if you are converting it in your head at 3 a.m. Set an alarm for the attackable hour, not the spawn hour.

RaidHours makes the last point automatic. On the World Events tracker you can see every boss window already converted to your local time, with a live countdown to the next attackable spawn and a one-tap alarm so you are logged in and in position before the seal breaks.

How RaidHours converts server time to your timezone

MIR4 publishes every schedule in a single server time. RaidHours takes that fixed clock and translates it to your region, so the guesswork disappears. Supported regions and their UTC offsets:

For example, Turkan becomes attackable at 23:00 server time on Thursday. An EU player (UTC+2) and an NA player (UTC-4) experience that same moment at very different local clock times — RaidHours does that arithmetic for you and shows a countdown to the exact instant the boss unlocks. It also covers the daily 18:00 reset, so your day rolls over at the right time no matter where you play.

The tracker is free with no registration, includes alarms, and can export the whole schedule as an ICS calendar file you drop into Google Calendar, Apple Calendar, or Outlook. Beyond world bosses, it also tracks Secret Peak field bosses and Magic Square farming chambers so your entire weekly rotation lives in one place.

Frequently asked questions