The Soul Sand Valley has been announced to be a new biome for the nether and here are my ideas for this potentially interesting biome.
Two new mobs:
Stoker: The Stoker is an hostile insect like mob with long stilt like legs which it uses to traverse the sands of the Valley with great speed. The Stoker attacks any unfortunate explorer who finds themselves crossing paths with the Stoker.
Due to its large stilt like legs the Stoker is very fast and is unaffected by the soul sands slowness. On attack the Stocker inflicts slowness on the player. The Stoker only spawns in the Soul Sand Valley
Wandering Soul: The Soul Sand Valley should have actual Souls. The Wandering Soul has two variants; malevolent and helpful, but upon interacting with the wandering soul will a player discover its true nature. Helpful Wandering Souls will grant the player buffs and protect the player against any Stokers by attacking Stokers. Malevolent Wandering Souls will upon interaction turn red and attack the player. So it is a 50/50 chance to get either a helpful wandering soul or a Malevolent wandering soul. Wandering Souls do not leave the Soul Sand Valley and only spawn in the Soul Sand Valley
Grave yard: A somewhat rare structure that spawns in the Soul Sand Valley. It has mob spawners that only spawn hostile malevolent wandering souls and has chests full of loot.