API UnitFactionGroup

Returns the faction (Horde/Alliance) a unit belongs to.
 englishFaction, localizedFaction = UnitFactionGroup(unit)
==Arguments==
:;unit: : UnitId
==Returns==
:;englishFaction: - Unit's faction name in English, i.e. "Alliance", "Horde", "Neutral" or nil.
:;localizedFaction: - Unit's faction name in the client's locale or nil.
==Details==
* The function returns may not return correct results until after PLAYER_ENTERING_WORLD event for units other than "player".
* Note that for NPCs, the function will only return Alliance/Horde for factions closely allied with either side. Goblins, for instance, return nil,nil.
* Pandaren player characters on the Wandering Isle return "Neutral", "".