[quote=@Hinsek]
<Snipped quote by Unoedipal>

Could I apply it as an assassin and just have Bellerophon be the beast taming bridle and not include a summoning? 
[/quote]

Sure, that would be fine since the mantle ought to let him qualify. Since Rider is the class where you get all the crazy NPs though, he'll probably lose Bellerophon proper. You can keep the horse though.