Spawn of Crota 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
The heralds of a dark future, led by the champion of a long-forgotten king. Crota and his legions once banished us from our own Moon. Now we fear they are rising again to claim Earth.
Grimoire text written by Bungie, shown as it appears in the Destiny 1 game files.