Minecraft traps

Materials: 1 netherrack,
a fire source,
and some soul sand

Dig a hole and put netherrack in it. Now, surround the netherrack with soul sand.The amount surrounding the netherrack is any. The trap is that, once a mob is on fire, they will slow down by the soul sand and you can easily get the loot. It works better if you use cobweb instead of soul sand.