Thorium Mod Wiki
Abyssal Shell
  • Abyssal Shell item sprite
  • Abyssal Shell equipped
Stack digit 1.png
TooltipClicking the Encase key will place you in an impenetrable shell
While encased, you cant use items or health potions, life regeneration is heavily reduced, and damage is nearly nullified
Leaving the shell will greatly lower your speed, damage reduction and damage briefly
Leaving the shell will prohibit the use of the shell again for 20 seconds
Grants BuffAbyssal Shell (buff).pngAbyssal Shell
Buff tooltipJust about nothing can harm you!
Inflicts DebuffAbyssal Weight.pngAbyssal Weight
Debuff duration20 seconds
Debuff tooltipDamage, defense, and movement speed greatly reduced
RarityRarity Level: rainbow
Sell19000*1 Gold Coin.png 90 Silver Coin.png
Dropped by
Entity Quantity Rate
Treasure Bag (Abyssion, The Forgotten One) 1 100%
Treasure Bag.gif
Fortune and glory, kid.
Expert Mode-Only Content: This information applies only to Expert mode and Expert mode worlds.

The Abyssal Shell is a Hardmode accessory. It provides the ability to enter a shell by pressing the Encase key, making you invulnerable to most forms of damage. However, while affected, your movement speed and life regeneration are drastically reduced, you are unable to use items and all damage output is mostly nullified. Pressing the Encase key again will exit the shell and inflict the Abyssal Weight debuff, briefly reducing your speed, damage and damage reduction.

This item is obtained from the Treasure Bag of Abyssion, The Forgotten One in Expert Mode only.


  • Due to the Moon Lord's attacks having separate invincibility timers, its attacks are unaffected by the Abyssal Shell.


  • As the player in the shell does not receive any damage, a viable strategy in multiplayer is to have the player in the Abyssal Shell distract the boss while the others kill it.


  • Changed defense reduction to decreased damage reduction.
    • Changed activation key.
    • Changed penalties on use.
  • Introduced.
Expert mode items
Treasure Bag.gifTreasure Bag • Zephyr's Feather.pngZephyr's Feather • Ancient Storm Mask.pngAncient Storm Mask • Sea Breeze Pendant.pngSea Breeze Pendant • Vampire's Catalyst.pngVampire's Catalyst • Eye of the Storm.pngEye of the Storm • Champion's Wings.pngChampion's Wings • Omega Drive.pngOmega Drive • Ice Bound Strider Hide.pngIce Bound Strider Hide • Mirror of the Beholder.pngMirror of the Beholder • Phylactery.pngPhylactery • Abyssal Shell.pngAbyssal Shell • Ancient Light.pngAncient Light • Dormant Hammer.pngDormant Hammer • Mjölnir.pngMjölnir
Dark Gift.pngDark Gift • Dark Tome.pngDark Tome • Taboo Wand.pngTaboo Wand • Arcane Anelace.pngArcane Anelace • Ogre Snot-Gun.pngOgre Snot-Gun • Ogre Sandals.pngOgre Sandals • Hippocrati-crossbow.pngHippocrati-crossbow • Brew Blueprint.pngBrew Blueprint