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Precasian Den
Biome N/A
Consists of Skeletal Bricks.png Skeletal Bricks
Mob Spawners
Version added 1.0
ID See below.

Precasian Dens are structures that spawn underground in Precasia.


The game has a 1 in 600 chance to generate per chunk a Precasian Den variant underground in Precasia. Each specific den has a 33% chance to be the one generated. They will only generate on y = 5-7, but will extend above that.

Only one den can generate per chunk. They will only generate specifically in the Precasia dimension. Dens will not generate in superflat worlds with the biome set to Precasia.


An Iosaur den.

Precasian Dens are structures that spawn underground. They are composed of Skeletal Bricks. There are three types of dens:

  • A ring-shaped den that houses the Diocus.
  • A square-shaped den that houses the Iosaur.
  • An oddly-shaped den that houses the Spinoledon.

Each den type will only spawn the mentioned mob inside it, the player will have to find another den if they want to fight one of the other mobs. The Diocus type den is necessary to find to fight the boss King BamBamBam. Warning: All three of the mobs that can spawn in these structures are hunter mobs. The player must be hunter level 23 to fight Diocus, level 52 to fight Iosaurs, and level 59 to fight Spinoledons.


Hostile mobs[]

Diocus den only[]


Iosaur den only[]


Spinoledon den only[]



The following can be obtained from the mobs in this structure

Obtained from
Precasian Tokens.png Precasian Tokens Diocus, Iosaur, and Spinoledon
Precasian Upgrade Kit.png Precasian Upgrade Kit Diocus, Iosaur, and Spinoledon
Power Ray.png Power Ray Diocus
Rejuvenation Staff.png Rejuvenation Staff Iosaur
Squad Gun.png Squad Gun Spinoledon
Explosive Idol.png Explosive Idol Diocus


The player is able to configure the generation rate of Precasian Dens in general in the mod's config file. By default the gen rate is set to 600. This will set the rate to generate for all dens, the player cannot configure the rate of individual dens.

Data values[]

The ids for each den are listed below:

Den Id
Diocus Den DiocusDen
Iosaur Den IosaurDen
Spinoledon Den SpinoledonDen


Version Information
1.0 Added Precasian Dens.
3.0 Can now be configured in the mod's config.
Can now be spawned using the aoastructure or aoastructures command.