Quote Originally Posted by noxybell View Post
Based on Japanese DMM wiki, you cannot join any new union or leave your current union once the union event starts. So your best option is to stay within your current union for now. If you leave now, you will enter the 24-hour preventive time, which will roll over into the union event time, by then when you will be union-less and hence disadvantaged.
There's an official notice about this at Nutaku:

"Dear Gamers,
The Crucible of Combat is a Union based event.

Please keep in mind that the following Union functions will be unavailable for the duration of the event:
Kick Member
Leave Union
Disband Union"

The Japanese wiki I checked specifically mentioned that joining unions during the event was still possible.

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That sucks, my current union is relaly inactive. Nobody else plays much.