Whenever a raid ticket is earned there's a chance for it to be rare, for me it's about 20%~ for a raid ticket to roll rare. The grade of the boss seem to affect this chance, the grade A boss MVP drop seems to drop rare raid ticket more often.
MVP (most damage) on a boss guarantees a raid ticket drop.
General drop also have a chance to roll raid ticket.
Drops:
- 1x for MVP (guaranteed ticket)
- 1x for discovery
- 1x for Boss kill
- 1x for participation
So you can get a max of 4 drops per boss.
The best drop is actually the event stamina refill, if you can 1 hit boss each of these refill is worth like 20~ tickets plus a boatload of other drops.