I have to say I don't think Fear is really Domain material. It is more (Portfolio). From your description of the Domain(Portfolio), it's probably a (Portfolio) of a Domain like Emotions - because as far as I can see, emotional manipulation is effectively what Amon does. We already have Lifprasil as a Demigod of Emotion though.

Perhaps we can tenuously justify Fear being his Domain by having him emerge somehow from Lifprasil (perhaps Lifprasil, in his damaged state, became so fear-ridden [perhaps by the idea that he was done, that there is no future for him beyond whatever crippled state he's in] that those dark emotions manifested into a new being).

So yeah, I honestly don't think Fear is Domain material. You also forgot to put something for Concealment and Detection.

Edit: Lifprasil's CS - https://www.roleplayerguild.com/posts/3444354