Onyx Excavator Key

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Onyx Excavator Key
  • Onyx Excavator Key.png
Stack digit 1.png
TypeMount summon
Use time20 Average
TooltipSummons a drill to drill through the world so you can destroy all the neat world generation
with complete disregard for all the creatures that inhabit these lands. I am sure the EPA and PETA would like
to have a word with you afterwards.
The power of the destruction scales with the highest powered pickaxe in your inventory
Grants BuffOnyx Excavator (buff)Onyx Excavator
Buff tooltipDrill
Map color#800080 ●
RarityRarity Level: 3
Sell 1 Gold Coin.png 80 Silver Coin.png
Research1 required
Onyx Excavator (object).png
Onyx Excavator ambient object
Summons Mount
Onyx Excavator
Onyx Excavator.gif

The Onyx Excavator Key is a Pre-Hardmode mount summoning item that is obtained from the Cavern Bio-center Lab. When used, it summons an Onyx Excavator which acts similarly to the Basilisk summoned by the Ancient Horn but allows the player to drill through tiles. The digging power of the drill is equivalent to the highest pickaxe power item the player has in their inventory. Like the Basilisk, it can charge enemies and deals 25 damage upon contact. This damage can be increased by summoner bonuses.

The Onyx Excavator is capable of moving and digging at a speed of 40 mph horizontally and can jump a single block off the ground. It provides a small amount of light when in use.

Standing next to blocks and holding the "use" button causes it to mine out most of the blocks on either side of it and allowing you to use the item you're holding as normal.

While horizontally moving at over half the mount's maximum run speed (20 mph), the player's damage reduction is increased by 10%. This is calculated independently from normal DR and is not affected by Calamity's DR scaling system. Additionally, all fall damage the player takes while inside the excavator is reduced to 5, increased to 10 in Hardmode.

The Onyx Excavator can only dig to the sides. It cannot dig vertically.


  • Several blocks are specifically blacklisted to prevent sequence breaks:
  • Falling down the edge of a 2-block wide shaft while holding "use" will allow it to mine all nearby blocks, widening the shaft to 5 blocks, while mining most of the 6th column behind it.
    • This could be useful for containing the spreading biomes, as they cannot spread across a 5-block wide gap.
  • The Onyx Excavator Key can be used with the Rubblemaker's large mode to place its tile form.


  • The mount is a reference to the Acceleration Drill from the Avalon Mod, with both digging through tiles in a similar way.
  • The tooltip references PETA and EPA, both being real companies which aim to protect animals and the environment respectively.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Can no longer mine Molten Pyre Mantle or Pyre Mantle.
  • Can now be used to place its tile with the Rubblemaker.
  • Fixed it being able to mine Charred Ore pre-Brimstone Elemental.
  • Now scales with the best pickaxe in the player's inventory.
  • Fixed mount dash not benefitting from increased all-class damage.
    • The drill mount can now destroy Dungeon bricks if Skeletron has been defeated, but can no longer break Demon Altars, Crimson Altars, and Arena Blocks.
    • Fixed the drill mount being able to able to destroy chests.
  • Fixed weapon offset bugs while riding the mount.