User blog comment:Patstriker25/Being of light Vs Indoctrination/@comment-2250460-20130726050910/@comment-2250460-20130727040029

They are also. It's both. Remember the Leviathans made the Catalyst in order to solve the perceived Organic vs Synthetic conflict, only for the Catalyst to turn against them and use a slave army (it's very vague about the nature of the Catalyst's forces) to kill the Leviathans and harvest them into the first Reaper, Harbinger.