User blog comment:DirgeOfCerberus111/Adeptus Custodes Vs. Grey Knights/@comment-1536954-20110819112502

Yes, they wear the specialised aegis armor, as well as having daemonic wards placed under their skin, built into their armour, the armour being anointed in holy oil as lubricant, covered in holy scriptures, and overall being psychically bonded and built to channel the battle brother's psychic ability.