Knowledge of Dark Depths
Magic tome which can summon Beasts of the Depths - minions who will attack nearby hostiles for 30 seconds.
POV: You're Dead
Illuminated Depths
The Illuminated Depths item is a staff which can summon a "Seeking Soul." This soul will chase nearby hostile mobs, slowly dealing damage to them over time.
Warden Loot
All available items in Echoing Depths. Craft the armor set with Warden Heart & Netherite Armor in a forging table. Weapons have a 50% chance to drop on Warden kill.