So apparently Vayne married sylas.

Fortune Favors the Lucky | Lunar Revel 2019 Skins Trailer - League of Legends
Join Firecracker Sejuani, Firecracker Vayne, Lunar Wraith Sylas, and Coin Emperor Tahm Kench in celebrating the Year of the Pig! Lunar Revel returns to Summoner's Rift from January 28, 2019, at 8:00 a.m. PT - March 4, 2019, at 11:59 p.m. PT.
In the video it clearly shows vayne shooting sylas to the knee. And in nordic slang taking an arrow to the knee means marriage.
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