Soul Soil

Soul soil is a block naturally found only in the soul sand valley.

Breaking
Soul soil drops as an item when broken with any tool or by hand, but a shovel is the fastest way to break it.

A soul campfire, when broken without using a Silk Touch tool, drops a block of soul soil. Since soul campfires can be crafted with renewable soul sand, this makes soul soil renewable as well.

Natural generation
Soul soil generates naturally in the soul sand valley biome.

Usage
Unlike soul sand, soul soil does not slow mobs down and does not create bubble columns.

Fire
Fire lit on soul soil becomes soul fire.

Withers
4 blocks of soul soil (or soul sand) are used in the construction of a wither.

Basalt
Lava on top of soul soil and directly adjacent to blue ice turns into basalt. Re-producing basalt this way can comprise a "basalt generator."

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