The information here comes from a post made by the official account on Hoyolab on 8 March 2026.

The Express crew arrives at Planarcadia, only to get swept up in the “Phantasmoon Games,” a quest to gain an audience with an Aeon.
Yao Guang helps Sunday become a Supplicant. The Trailblazer defeats Sparxie at SparxiCon.
The dangerous mists of doubt hidden beneath the arcadia begin to surface.

Current Known Supplicants: 3/8