Where can I find advanced orbs of alchemy?
Other replies to questions about orbs say it's best to buy energy and get them from the SD, but I want to find them and use the crowns I get for equipment recipes.
I also know what stratum they usually drop.
But what's the best place in that stratum to find orb drops?
Missions? If so, which missions? Arenas (there's an easily farmable arena in the right stratum available right now)? Try to get into treasure vaults?
(EDIT: Graveyarded, I don't need advanced orbs anymore)