Features

• Overhauled Nether Fortresses with a new structure build, loot table, and mob
  Mobs
• Added Wither Hounds
  • Aggressive and untamable wolf variant that spawns in nether fortresses. Don't get bitten

Fixes

• Fixed a typo in the 'Tastes like Prismarine' advancement

Technical

• World Gen
  • Vanilla nether fortress structures have been removed from the [nether_complexes] structure set
  • The overhauled nether fortress has been added to the [nether_complexes] structure set and has the identifier [echoo_structure:nether_fortress]
  • A datapack can be made or the structure set files can be modified to restore vanilla nether fortresses
• Wither Hounds
  • Data driven wolf variant scaled up with attributes
  • Tagged with [wither_hound]
  • Can be summoned using the [echoo_structure:entity/wither_hound/summon_wither_hound] function