What's the point of occult crescent?

[YumieYumiki]

Doing regular fates is horribly boring. CEs have a pretty high drop rate (20% according to yoshi), and for each demiata type, there's one CE that you can trigger by killing a bunch of a specific mob (https://ffxiv.consolegameswiki.com/w...cal_Encounters), so you have some control over it. If you're missing like just 1 or 2 you can focus the OC fates and CEs that drop them when they're up, and when they're not, kill the relevant mobs to trigger the CE you need