Planet Halmut (할무트) is/was the planet nearest to Willarv in the Fedust star system.
The planet was covered with a thick ice crust and had a dark ocean of unknown depths underneath.
It was inhabited by Gandharva clan suras, but humans were not able to live on it due to its frosty climate.
In the finite, Taksaka smashed all of Halmut's ice crust, believing it was the place where Ian died and wishing it into nonexistence.
In Season 3, it was revealed that the planet was habitable for humans until 200 million years ago, when Gandharva drowned all the humans under a layer of ice and made it a place for inferior Gandharva suras to live in.[1]
Maruna brings Samphati to this planet to avoid the gods from spotting them during the battle of N23.[2]