Trying to find a server where it's even possible to craft this, as there's an achievement that requires. Everything I've read points to Hypo, and I can't even find a MyM Hypo server (anymore). If I'm somehow just overlooking it, or if this is an achievement that can't be obtained, please let me know. Thank you for your time, and have a blessed day.
Hypo server was taken down a while ago. And as vikingghost11 has said, you can craft this on Project Ozone 2
To be more specific, you can craft the Sword of the Cosmos on Project Ozone 2: Kappa, I am not sure if it is craftable on the Normal mode, but I know for a fact you can do it on Kappa mode. That is where Aidoneus and I made and submitted ours. To the best of my knowledge, this is the only server where it is currently possible to make the Sword of the Cosmos. But I haven't checked every server so someone else might be able to speak up for one of the other servers. Hope this helps! Good Gaming and Have a Great Day!