Cosmic Feed

Cosmic Feed is a quick Monument of Triumph objective: feed the Starhorse.

How to complete

1. Open the Director, go to Eternity and launch Xûr's Treasure Hoard (not the Dares of Eternity activity itself).
2. In the social space, walk to the center of the main room, where Starhorse stands near Xûr and the vendors.
3. Interact with Starhorse when the prompt appears. The triumph completes immediately; no combat needed, under a minute.

Rewards

NerdsChalk reports 10 Legendary Marks; NoobFeed only says the triumph completes and counts toward Monument of Triumph progress.