I remember juggernaut in halo, it better suits imho. I am not saying that this is all very bad idea, but it has some problems and dislikes. First of all the term "taken" if u ever read lore means that someone has taken the creature (in grimore they stick also with a term gifted and etc., meaning its and evolution of creature that was taken) using the power of the deep (darkenss). This power is supposed to be like some kind of magic. And only a few have this power. Especially in the story only Oryx had that power and he is supposed to receive it from the darkness itself. So in doesnt suite with kind of infection from gardian to gardian in any possible way. The one with juggernaut - when one of the 6 has superior power and when u kill him u gain his power - this seam much more suitable.