Centurion is a Grimoire card from the original Destiny (Destiny 1), found under Enemies → Cabal. Grimoire cards held most of the game's lore and were read on Bungie.net and in the companion app, not in the game itself.
Card text
Centurions are tactically intelligent, highly skilled field commanders. Their armor boasts a formidable array of combat electronics and deployable munitions.
Grimoire text written by Bungie, shown as it appears in the Destiny 1 game files.