Treasure Bags are consumable items obtained in Expert Mode as a reward for defeating bosses. Its contents depend on the boss it comes from. It is opened by either right-clicking it inside the inventory or using it while it is in your hand. In multiplayer, each player that is online at the end of the battle receives one Treasure Bag each. Treasure bags are client-side and will despawn if you exit the world.
Each Treasure Bag contains the boss's usual drops from normal mode, along with at least one Expert Mode-exclusive item (pink-highlighted items below).
All Thorium Boss Bags additionally have a 3.33% chance to contain one random set of developer items.
In addition to the above, all Treasure Bags (excluding the Lunatic Cultist Bag) have a 3.33% chance to contain a random set of developer items, with a 20% chance in Hardmode to obtain Phonic Wings alongside the random set. Obtaining a Treasure Bag in an Expert world, then opening the bag in a Normal world will retain the Treasure Bag's chance to yield developer items.
Expert Mode-exclusive item details[edit | edit source]
| Bag |
Boss |
Items |
Ability
|
 |
The Grand Thunder Bird |
 Zephyr's Feather |
Allows player to ascend and glide short distances with the help of a Grand Thunder Bird hatchling.
|
 |
The Queen Jellyfish |
 Sea Breeze Pendant |
Allows swimming, breathing underwater, and increases damage while in water by 10%.
|
 |
Viscount |
 Vampire's Catalyst |
Allows the player to transform into a bat, which makes the player capable of flight and provides immunity to most bat enemies.
|
 |
Granite Energy Storm |
 Eye of the Storm |
While equipped, energy will slowly seep out and attack nearby enemies
|
 |
The Buried Champion |
 Champion's Wings |
Decently powerful Pre-Hardmode wings
|
 |
The Star Scouter |
 Omega Drive |
Summons a pet Omega Probe that has offensive capabilities.
|
 |
Borean Strider |
 Ice Bound Strider Hide |
Damage done against Freezing enemies is increased by 15% and has a chance to heal the player lightly.
|
 |
Coznix, The Fallen Beholder |
 Beholder Staff |
Summons a Beholder to lay waste to your enemies, which takes up 2 minion slots and reveals nearby enemies.
|
 |
The Lich |
 Lich's Gaze |
Pressing the Special Ability key will trigger True Strikes, which requires a 2 minute recharge time.
|
 |
Abyssion, The Forgotten One |
 Abyssal Shell |
Pressing the Abyssal Guard key will place you into an impenetrable shell, granting invulnerability but disallowing use of items and nullifying damage done.
|
 |
Lunatic Cultist |
 Ancient Light |
Shoots three bolts of primordial energy that inflict high magic damage over a large area of effect.
|
 |
The Ragnarök |
 Dormant Hammer |
Used to craft the Mjölnir, which throws an image of the legendary weapon, releasing a storm of energized lightning bolts that deal very high True Damage when hitting an enemy.
|
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