https://minecraft.fandom.com/wiki/Minecraft_Dungeons:Wither_Skeleton

Wither Skeletons will run-up to the player incredibly fast, hit them with their sword, deal melee damage, and inflicting a wither effect that deals a bit of additional damage over time. Unlike in the base game, they also have a ranged variant that wields a Red Snake. After hitting, they kite their target similar to Baby Zombies by retreating for a short time before rushing again. They are also capable of sensing players even with the Shadow Form.

Nether Wastes Basalt Deltas Nether Fortress Warped Forest Soul Sand Valley Gold Room

https://minecraft.fandom.com/wiki/Minecraft_Dungeons:Wither_Skeleton_Archer

Wither Skeleton Archers attack by shooting at players from a distance with a Red Snake, firing black coloured arrows that inflict Wither. They basically behave as normal skeletons do, only their arrows inflict Wither.

Wither skeleton archers look identical to normal Wither Skeletons Only there are equipped with a Red Snake. Spawning Nether Wastes Basalt Deltas Nether Fortress Warped Forest Soul Sand Valley Gold Room In other levels in Seasonal Trials during the Anniversary Event