Additional Creatures Wiki

Hydrarchos is a fictional species of mammal in Additional Creatures.


A large whale, similar in size and in relation to Basilosaurus, "Hydrarchos", as it is called, is a much more aggressive predator. While definately powerful, it appears Hydrarchos is a specialist predator of the ocean. While the ocean is rich in life, it appears Hydrarchos has evolved specialized teeth. These teeth are sharp, large, and broad- like the heads of swords. These teeth are evolved for biting into large, soft flesh- in other words, blubbery creatures. Whales, Plesiosaurs, Mosasaurs- pinnipeds, even. These vicious teeth sink into the fatty hides of these creatures and cause profuse damage and bleeding, making a quick kill and protein, calorie-rich feast for Hydrarchos. This makes Hydrarchos excellent for dealing with some of the water's more tanky predators. To a survivor, this makes Hydrarchos an excellent Tankbuster and a key creature against dealing with enemy Basilosaurus, or other deep-sea creatures with a bit of fat to absorb blows...

Color Regions

Color Region 1 - Shading

346110 screenshots 20200316164301 1.jpg

Color Region 2 - Underside

346110 screenshots 20200316164344 1.jpg

Color Region 3 - Pattern

346110 screenshots 20200316164407 1.jpg

Color Region 4 - Face and Flipper Undertones

346110 screenshots 20200316164421 1.jpg

Color Region 5 - Face and Flippers

346110 screenshots 20200316164434 1.jpg

Base Stats, Controls, and Abilities

Attribute Base Stat
Health 1500
Stamina 600
Food 9200
Weight 500
Melee Damage 185%
Movement Speed 100%
Torpidity 2000

Left Click - Bite

52 Base Damage - Inflicts Bleed - Shreds Armor

Right Click - Roar

C - Echolocation On

Infrared Vision

X - Echolocation Off

Hydrarchos deal 2.5x damage to the following.....

Hydrarchos are immune to electrocution.

Hydrarchos give an insulation buff to their rider.


  • Hydrarchos means "Hydra Master". "Hydrarchos" as a taxon was a hoax, being the supposed remains of a sea serpent fabricated together with several basilosaurus skeletons.
  • The Hydrarchos was claimed to have sexual dimorphism during development, but this has not come to pass.