Mogstation taking another step to the darkside

[Allegor]

It's not an Easter Mount. If it was then this would make sense

That is true - the mount is simply a spriggy with no Hatching Tide decoration to be seen, though to be fair, it's questionable why a spriggan mount was added at the same time as the yearly event themed with spriggans. If the mount in question was literally anything else I doubt this thread would even exist.