Suggestion

Fumarole vents should be obtainable in the Nether, particularly in basalt deltas or soul sand valleys

Reason

This would enable skyblock players to access the fumarole - something currently impossible without commands.

Exsiting Mods

Botania's Garden of Glass mode allows for alternative methods to acquire most things in vanilla - it would be lovely if this could be crafted in a similar context, either through some skyblock config option like GoG, or through vanilla materials (possibly a recipe involving basalt?)

We would add a lead fumarole vent in 1.21, and maybe later back port in 1.20.