I'm tinkering with importing the idea of Specialty Priests and channeling a bit of DnD 4E by treating them as Feats.
Specialty Priests of Bane
Prerequisite: Cleric with War Divine Domain
• You learn two of the following languages: draconic, deep speech, goblin, High Shou, Midani, Mulhorandi, orc, undercommon, or Untheric
• You know the thorn whip cantrip and can also cast the fear spell once with this ability. You regain the ability to cast this spell when you finish a long rest. Additionally, you are immune to the fear spell.