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Alien onos normal front.png
Kharaa.png Onos
Personal Resources
Icon personal resource neutral.png 62 (+8 per Evolution)
700 (+50 per Biomass)
450 (517 / 583 / 650)
Icon resources energy neutral.gif 100 (110 / 120 / 130)
Ground Speed: 6.6 (7.1 / 7.6 / 8.1), 10.5 (Charge)
Crouch Speed: 3.3
Abilities and Upgrades
Alien Vision, Evolve Menu, Hive Sight, Gore (Smash), Charge, Bone Shield, Stomp
Carapace, Regeneration, Vampirism,
Adrenaline, Celerity, Crush,
Camouflage, Aura, Focus
Charge at biomass 2, Bone Shield at biomass 5, Stomp at biomass 8
Buy From: Evolve Menu
Purchase By: Player, Commander at biomass 9
Gestation Time: 30 seconds
A behemoth that can smash structures and charge into battle and gore players to death. He can also evolve stomp to stun his enemies.

In-game description.


The Onos is the largest and most costly Alien lifeform available. It is the ultimate weapon an Alien team can employ and is capable of causing huge destruction to Marines and their Structures.


The Onos is a gargantuan quadruped that appears as a cross between a Rhino and Gorilla, Despite its size, it is capable of reaching impressive speeds with its Charge ability and can deal significant damage to structures using Gore. When the Alien Commander researches Stomp, The Onos is also capable of sending out shockwaves that cause Marines that are unfortunate to be in its path to be knocked down, making them an easy target.


An Onos is a formidable and intimidating presence on the battlefield, however its size and cost also make it a valuable target for skilled or large groups of Marines who will go to great lengths to kill an Onos where possible.

An Onos should never venture into Enemy territory without a Gorge for support and a clear plan of escape. Marines with good map awareness will seek to cut off the escape routes of a fleeing Onos (a 'pinch') in order to deny the Alien team the use of this lifeform.

An Onos should use constant hit and run tactics, causing as much damage as possible or stopping Marine expansion in a certain area then retreating to heal as necessary. Ensure that Charge has been researched to assist in escaping from danger and never stray too far from somewhere you can heal.

A common mistake made by Rookies playing an Onos for the first time is the belief that you are indestructible. An Onos can be easily overcome by direct sustained fire and Marine Commanders have even been known to try and trap an Onos in a room by building a structure at the exits.

When Stomp is researched, it is likely this will become your primary attack. Using Stomp constantly against ground Marines will severely impede their progress and allow lower lifeforms to make easy kills. Stomp also disrupts the targeting of Sentries and detonates Mines.

Tactical Summary - Onos

  • Use hit and run tactics constantly, be confident but never over-commit.
  • Always have a plan to escape and always have a Gorge nearby.
  • Use Stomp to knock down Marines for easy kills.


Main article: Options.



Impales a target with the Onos' sharp horn, or smashes a robot or structure with the forelegs that deal extra damage.

Icon gore.png
  • Against Robots and Structures: Damage x 200%
  • Disrupts Marine's aim for a short time.
Mouse 1
Energy Icon resources energy neutral.gif 10
Damage 90
Type Structural
Range Melee
Fire Rate 0.57 seconds
Duration 0.7 seconds
Targets Marines, Robots, Structures


All Alien units have a movement mechanic that is unique to that class. Charge is the Onos' unique movement mechanic that grants it high forward movement speed. While charging, the Onos cannot change direction, but may attack at any time while halting the charge. When moving, the Onos creates noise and screen shake for nearby Marines, while also creating a stirred dust visual effect around the onos.

Icon charge.png
TRes Icon team resource neutral.gif 15 (research 40 seconds)
Energy Icon resources energy neutral.gif 20 per second
Damage 12
Speed Base speed + X
Cooldown 0.5 seconds
Requires Biomass level 2, Research Charge

Bone Shield

Extends the bone blades on the Onos' forehead to shield against damage from the front.

Bone Shield
Icon bone shield.png
  • Reduces all incoming frontal (roughly a 110° arc) damage by 80%
  • Onos can move slowly while active (speed of 4.5).
  • Costs 22 energy per second and cannot regenerate energy from Shift while active.
Mouse 1
TRes Icon team resource neutral.gif 20 (research 40 seconds)
Energy Icon resources energy neutral.gif 22 per second while active, minimal amount to initiate
Damage 80% damage negation from front
Duration Until cancelled/energy depletion seconds
Cooldown 0.425 seconds
Targets Bullets, Explosives, Flames, Railgun
Requires Biomass level 5, Research Bone Shield


Stomps the ground to create cracks and a shockwave along the floor, which cause nearby Marines to lose their footing temporarily.

Icon stomp.png
  • Against Structures: Damage x 200%
  • Disables Marines' attack and movement.
  • Disrupts Sentry targeting and fire rate.
  • Detonates Mines prematurely.
Mouse 2
TRes Icon team resource neutral.gif 25 (research 60 seconds)
Energy Icon resources energy neutral.gif 30
Damage 40
Type Heavy
Range 12
Radius 2
Duration 2 seconds
Targets Marines, Sentry, Mines
Requires Biomass level 8, Research Stomp


The following images show all the variations of Onos camouflage (skins) that you may see in the game.

Please note:

  • Skins are purely cosmetic and offer no augmented or additional stats in-game.
Camouflage variants & availability
Variant Description Acquisition Notes
Normal Default Camouflage. Provided with game. N/A
Reaper Red eyes, White skin, Black exo-skeletal features. Requires Reaper DLC. Released with the Reaper update.