The Cauldron of the Cosmos is a mystical relic stored in the New York Sanctum.
When Tony Stark was invited into the Sanctum by Doctor Strange so they could discuss the threat of Thanos, Stark casually leaned on the Cauldron of the Cosmos to do some stretching. This greatly annoyed Strange who used the Cloak of Levitation to quickly make Stark stop touching the relic, much to his surprise.
- In the comics, the Cauldron of Cosmos was a relic Dr. Strange used to ponder the mysteries of the universe for hours or to check for mystical threats.