A Soul Torch is a new type of light that was presented to Minecraft with the Netherupdate They act quite the very same way as a regular torch, however are practically just a color version, where the fire burns with a blue-green color.
To make a Soul Torch, you will need some charcoal or coal, a stick, and some Soul Soil or Soul Sand. Soul Soil can be found in the sound sand valley biome in the Nether, while Soul Soil can be found at around level 65 in the Nether wastes, at Bastion residues, or on the surface area of soul sand valley.
Place the stick in the center of the crafting table, with the coal or charcoal directly above it, and the Soul Sand or Soul Soil directly below it. One stick, soul, and coal/charcoal sand/soil will produce 4 Soul Toches.
If you are in the Nether, you should constantly have some Soul Torches with you, as they will drive away piglins, however not likely normal torches they will not melt snow or ice. You can also integrate a Soul Torch with 8 Iron Nuggets to create a Soul Lantern. Just like the Soul Torch, the Soul Lantern will also keep piglins away.