About D4BossTimer

D4BossTimer is a fan-made Diablo 4 world boss timer. It exists to answer one question fast — when is the next world boss? — and then to give you the context around it: which boss, what it drops, how to survive it and how the Season 15 Echo of Uber Diablo works.

How the timer works

• Pure arithmetic. Spawns happen every 210 minutes from a verified anchor spawn (2026-10-08 13:30 UTC, Wandering Death, cross-checked against helltides.com). No API, no server, no account.
• Exact vs predicted. Spawn times are exact. Boss order follows the observed 2× rotation and boundary spawns are labelled "predicted". Spawn zones are never predicted.
• Static site. Every page is pre-rendered HTML; the live countdown, notifications and weekly tracker are progressive enhancements that run only in your browser.

Data freshness

Anchor and rotation last verified October 2026. If Blizzard changes the cycle or adds a boss, the data in this site is updated and redeployed. Found a mismatch with what you see in-game? Email [email protected].

Disclaimer

Not affiliated with or endorsed by Blizzard Entertainment. Diablo is a trademark of Blizzard Entertainment, Inc. See the privacy policy.