Event Timings for Bloodstone Fen
Here’s what the Wiki reports:
The meta event appears every 90 minutes, starting at 15 minutes past the hour for even hours and 45 minutes past the hour for odd hours. Note: Even/odd hours depend on your timezone. Even/odd hours listed here on the wiki are in UTC. They are also not every even/odd hour, since the event spawns every 90 minutes.
The first event of the chain starts at the Ground Zero Waypoint. Players need to defeat either the Champion Jade Armor or Champion Jade Bow before it absorbs the Bloodstone Stalagmite. Once the first event has been completed, a new one will appear at the lower level, followed by two more of the same format. The final event of this type features both the Armor and the Bow bosses.
After all of the Jade bosses have been defeated, a Legendary Unbound Guardian appears deep within the Cavern of Unseen Lights. Players have a time limit of 15 minutes to defeat it.
Yeah I read that the other day, it was transcribed from a player report in the wiki feedback page. I waited at those minutes and no Jade event appeared, while the LFG for Jade keeps popping up continuously over the two hours, so I’m inclined to believe it’s not globally timed.