# Lost Ark Chaos Gate, field boss and wandering merchant times

> When Chaos Gates, field bosses, wandering merchants and co-op sailing start in Lost Ark, in server time for East North America and Central Europe and in your own time.

Canonical: https://lostark.wiki/guides/chaos-gate-field-boss-and-merchant-times
Last updated: 2026-10-25

Chaos Gates open at 50 minutes past the hour from 10:50 to 23:50 server time on Monday, Thursday, Saturday and Sunday, and keep opening until 04:50 the next morning. The field boss [Sevek Atun](https://lostark.wiki/database/npcs/sevek-atun-300990) appears on the hour from 11:00 to 23:00 on Tuesday, Friday and Sunday, and until 05:00 the next morning. [Event Timers](https://lostark.wiki/tools/event-timers) turns these schedules into the next start in each live region, next to the same moment on your own clock.

## Server time in each region

Lost Ark runs its schedules on server time. East North America keeps US Eastern time and Central Europe keeps Central European time, and both switch for daylight saving. Event Timers lists each region on its own. For every event it shows the next start in server time and in your local time with a countdown that updates every second, then the remaining starts of the server day, and the coming days behind a Coming days button.

![Event Timers for East North America with the next Chaos Gate in server and local time, its countdown and the rest of the day's openings](https://lostark.wiki/images/guides/chaos-gate-field-boss-and-merchant-times/east-america-chaos-gates.webp)

## Field bosses, merchants and co-op sailing

Most field bosses are scheduled at the start of every hour, and Sevek Atun follows the Tuesday, Friday and Sunday hours above. Every wandering merchant visits twice a day, 12 hours apart. [Aricer](https://lostark.wiki/database/npcs/aricer-80022) arrives at 10:00 and 22:00 on Monday, Wednesday, Thursday and Friday, and at 04:00 and 16:00 on Tuesday, Saturday and Sunday. Co-op sailing in the Sea of Gienah and the Sea of Procyon starts at 19:30, 21:30 and 23:30 server time every day.

![Event Timers for Central Europe with the next start of the hourly field bosses and of Sevek Atun](https://lostark.wiki/images/guides/chaos-gate-field-boss-and-merchant-times/central-europe-field-bosses.webp)

Event Timers also lists Adventure Island sessions. Check the displayed region and date before planning a trip. A scheduled start does not confirm that maintenance has ended or that the event is currently active.

## Related

- [Guides](https://lostark.wiki/guides)
- [Home](https://lostark.wiki/)