New Nether Biomes
The Lurker in the Deep
Find this mob in the deepest oceans
Night Litch
Find his tower using stars to find your way
In the Swamp lands
Strange huts with new wood types
Obsidialith
End Boss, located far in the isles
The Kraken
Can be found in large shipwrecks in the deep oceans
Ghost Towns
Find haunted towns in the mesa
Boss Towers
Find these all over your world
Deep underground
Find abandoned "chests"
New structures
Ocean mineshafts
Glow Squids
Blue Forest
Blackstone Golem
New Nether boss, summons with a few blackstone shards that can be obtained through piglin trades