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."

Fast travel
Using Soul Speed enchanted boots when walking/sprinting over soul soil, similarly to soul sand, increases player movement speed (but unlike soul sand, soul soil doesn't reduce player speed without the enchantment). The effect occurs even if the soul soil is covered with slabs or other blocks of height less or equal 0.5m. Soul speed III gives sprint speed of 9m/s (vs 5.6 without). The effect is cumulative with the Speed effect (from a beacon of a potion; 12.7m/s), and in case the soul soil is covered with water, Depth Strider and when swimming, Dolphin's Grace allowing for creation of highways that allow covering hundreds of blocks in seconds.

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