Update as of 1.2
It is no longer worth farming curio sigils anywhere besides Behemoth. He drops up to 3 curios per run, as well as a chance at a curio, or curio+ sigil (0.8% per sigil, or 8% per run for any Curio+) , at much better rates than curios themselves. This makes curios effectively useless. In less than 1 week of AFK farming Behemoth through the night, you’ll earn more Supp V+ than 20k quests of curio farming.
Lately, there’s been a lot of talk about curios, with a lot of misinformation regarding how they’re obtained, what they hold, and at what rates. Here we’ll clarify everything we know based on datamines from both Korean and other communities, as well as my own testing and analysis.