Maintenance for the week of November 25:
• [COMPLETE] Xbox: NA and EU megaservers for maintenance – November 27, 6:00AM EST (11:00 UTC) - 9:00AM EST (14:00 UTC)
• [COMPLETE] PlayStation®: NA and EU megaservers for maintenance – November 27, 6:00AM EST (11:00 UTC) - 9:00AM EST (14:00 UTC)
Banner buffs reset when someone enters / leaves banner area
So for arcanist this means then generate a crux every time someone enters the AOE. Yes, this means you can generate max crux in 1 second.
For sorc this means the damage proc literally won't do anything if someone enters the banner area every second since the damage tick isn't on the first second.