I saw this while reading a Destiny 2 article on GameRant and I thought: Maybe the Fallen have given up finally and want our help. After all, they did have the Traveler on their planet, so why not share the powers with them? Where this theory came from: https://www.bungie.net/en/Grimoire/2/4611686018463202769/Allies/LegendsMysteries?_unlocked=False and https://gamerant.com/destiny-2-theory-fallen-allies/.
The card is Ghost Fragment: Fallen 6.