THIS ONLY WORKS IN 1.16(20w16a) AND UP!

This is probably the weirdest idea I've ever had. The idea developed as I was playing 1.16 snapshots, and rapidly realized the soulsand valley is ABSURDLY hostile. Its defining feature is the presence of at least two ghasts at all times, coupled with blocks that slow you down. At some point I entered a thought process that ended with "what if the entire overworld was a soulsand valley, and what if ghasts dropped everything you needed?" and so Ghastblock was born, the ghastliest concept for a skyblock ever.