Since their VFX in game are very similar, same their concepts as astral beings that govern order, heal and life/death
Riot can introduce a new Faction, something like the ''Divine Grove''.
Soraka comes from there, fallen.
Bard walks throught many planes of existence, but the divine grove is his home-realm
same for Kindred, roaming to hunt in runeterra.
And, as an extra: the Divine Grove can be as an Opponent faction of The Void.