This doesn't exist in Minecraft; it's just fiction
Wither Centipedes are Centipedes that are hostile and Boss like creatures that are found in many places mostly in the BlackNether and in Caves in Leethers. All of them are 10 blocks tall and very big and destructive. They love Soul Sand and Leethers' Dirt.
They are more destructive than any Centipede and are spawnable by digging holes around four Soul Sand cubic and add either bonemeal or Possible Pollen on each and they are spawned. When attacking they shoot Blue Wither Skulls Bomb. Like Nether Creatures, they do not die in Lava or Fire. When killed they drop 7 Soul Sands, A Nether Star and a Centipede Leather.
They are Mostly found in the Leethers and is very rare in the BlackNether.