[Illusion]

Originally Posted by Coda

Mythlits drop from Tower of Flare through Tower of Nature and all of the first-tier Technical dungeons.

Dub-Mythlits only drop from Hill of Iris's Rainbow and Starlight Sanctuary -- near-endgame dungeons you almost certainly don't have access to.

This leads me to believe you're actually asking about the singlits and dublits in general. The singlits from the first-tier dungeons -- that is, Dungeon of Wood etc. The appearance rates are kinda low and the drop rates aren't great, but it's still worth farming them especially at half stamina.

I'm actually at Starlight Sanctuary now, and I'm well passed Hill of Iris's Rainbow.... And I farm Rainbow and Ocean of Heaven daily.

I just need to kow a good place for the Singlits because I haven't seen one in months, and I have a few monsters that need them. (Hades and whatnot.)