New Weapons:

Battle Axes: They have a higher attack damage than a regular axe, has the same attack speed, but cannot mine wood
Shattered Blackstone Sword: Weak Sword that can be upgraded into...
Refined Blackstone Sword: Upgraded version of the Shattered Blackstone Sword that when held gives positive buffs, as long as the off hand slot is empty

New Mobs:

Blackstone Pebbler: A small blackstone rock formation that spawns in the nether and drops an item used to summon the...
Blackstone Golem: A huge blackstone formation that is summoned by the Blackstone Eye crafted with Blackstone Shards
Redstone Golem: Mob from Minecraft Dungeons brought to the main game (Mini Boss) and summons the...
Redstone Mines: Summoned by the Redstone Golem (Glitchy) and explodes on contact to a player
Endersent: Mob from Minecraft dungeons brought to the main game (Mini Boss)