Sand Eaters 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
The Cabal formation first and most frequently encountered by Guardians, the Sand Eaters represent the numerical bulk of the Cabal presence on Mars. Their equipment, tactics, and morale all show the weight of a long deployment - but they continue to pursue their objectives with dogged, weary determination.
Grimoire text written by Bungie, shown as it appears in the Destiny 1 game files.