API UnitFactionGroup

Get the name of the faction (Horde/Alliance) a unit belongs to. englishFaction, localizedFaction = UnitFactionGroup(unit)

Arguments

 * unit : String - UnitID you want to get the faction for

Returns

 * englishFaction : String - Unit's faction name in English, i.e. "Alliance", "Horde" or nil.
 * localizedFaction : String - Unit's faction name in the client's locale or nil.

Details
The functon returns correct results after the PLAYER_ENTERING_WORLD event.

Note that for NPCs, the function will only return Alliance/Horde for factions closely allied with either side. Goblins, for instance, return nil,nil.