Reapers indoctrination happens whenever they are close to reaper tech and they can drag covenent soldiers off to indoctrinate them Even key covenent leaders can be indoctrinated and be secretly used to cause havoc within the political system Reaper ships are very advanced for what they are they have been seen to litterally grab onto ships crushing them and ripping them in half Ships have the capability off traversing the ground of planets and keeping in orbit and firing reaper forces into battle fast They have two forms of ground attack on their ships being a heavy laser that is capable of destroying buildings and a laser about half the power of that used on ground forces Along with Capitol ships able to land on the surface of planets too such as harbinger the oldest reaper