Knight is a Grimoire card from the original Destiny (Destiny 1), found under Enemies → Hive. 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
A roaring, striding fortress, the Knight is the Hive's foremost and most zealous defender. Centuries of battle have toughened the bony protrusions on its body into an armor as hard as relic iron - a defense only strengthened by the Hive magic that Knights use to summon shields of burning force.
Grimoire text written by Bungie, shown as it appears in the Destiny 1 game files.