The Artifact Siege runs twice a week, Thursday and Saturday at 21:00 server time. The three artifact bosses follow at 21:30. With the server clock at UTC+9, that is 12:00 and 12:30 UTC.
Argo, the Spirit King is the Abyss boss. It spawns twice a day.
The schedule changed on November 4, 2026
- Before: three sieges a week.
- Now: two a week, Thursday and Saturday, at the same 21:00 as before, per NC's patch notes.
- The three artifact bosses moved with it: Thursday and Saturday at 21:30.
Trackers that still list a Monday siege are out of date.
Field bosses have no fixed time
Gartua and High Commander Lagta respawn on a timer that starts when they die. NC cut that timer from 12 hours to 11 hours on November 4, 2026. Their next spawn depends on the last kill on your server, so no countdown can show it without live kill reports.
The one open question: which clock
NC writes "21:00" without a time zone. Players report that the global servers show a UTC+9 clock, which puts the siege at 12:00 UTC. NC also ran separate daylight-saving maintenance for Europe, NA East and NA West, so regional clocks are possible. Check the clock in your game once and compare it to the countdown.
FAQ
What days is the Artifact Siege in AION 2?
Thursday and Saturday, since the patch of November 4, 2026. Before that it ran three times a week.
What time does the Artifact Siege start?
21:00 server time. With the server clock at UTC+9 that is 12:00 UTC: 04:00 in Los Angeles, 07:00 in New York and 13:00 in Berlin in winter.
When do the artifact bosses spawn?
Thursday and Saturday at 21:30 server time, 30 minutes after the siege starts.
When does Argo, the Spirit King spawn?
Twice a day at 10:30 and 22:30 server time, according to NC's patch notes.
Is there a timer for Gartua and Lagta?
No fixed one. They respawn 11 hours after they are killed, so the time differs on every server.