This mod is part of The Vanilla Experience.
A minimalistic configurable mod which adds a chance for strays to spawn naturally everywhere instead of a skeleton spawn. By default in the vanilla game they can only spawn in ice biomes, but they are too cool looking to not have them everywhere.
chanceSkeletonIsStray (default = 0.25, min 0, max 1.0): The chance a skeleton that has spawned is of the stray variant.
The Stray entity: