Production information
Manufacturer Achernar BattleMechs[1]
Production Year 3063[2]
Model OSR-3D[1]
Class Light
Cost 5,243,550 C-bills[2]
Technical specifications
'Mech type Inner Sphere BattleMech
Mass 30 tons
Chassis FITES-O [endo steel]
Armor StarGuard Ferro-Fibrous
Engine Pharaoh 240 XL
Communications System Achernar Electronics HID-8.7
Targeting Tracking System Federated Hunter Mk. VII
Heat Sinks 10 double
Speed 129 km/h
Jump Jets Rawlings 61
BV (1.0) 937[3][4]
BV (2.0) 1,138[1][2][5]


The Osiris was essentially modeled after the Clan Dragonfly and designed by the same engineers who designed the Anubis. While the limits of Inner Sphere technology forced the designers to skimp on the specifications somewhat, the Osiris does maintain the same speed as the design it is based off of with its powerful Pharaoh 240 XL engine. The armor and jump capacity are sadly lacking, however, as the Osiris can only jump half as far as the Dragonfly with its four Rawlings 61 jump jets, and is armored with four and a half tons of StarGuard ferro-fibrous. The Osiris was designed to be a fast, hit-and-fade style offensive platform and can perform well in that capacity with its awesome speed, although it does appear to rely too heavily on its mobility to protect it from damage.[6]

Weapons and Equipment[edit]

The Osiris' primary weapons are its five Bright Bloom ER medium lasers, which can dish out a lot of damage very quickly, and are perfect for a light 'Mech that may be operating far from resupply. The Harpoon-6 SRM-6 gives the 'Mech a supplementary short range punch, while the Double-Gun machine gun can quickly deal with unarmored infantry. Pilots do have to be very careful, however, as the 'Mech can overheat rather rapidly if it gets pushed too hard.[6]


  • OSR-5D 
    This Jihad-era variant developed in 3081[9] drops all the weaponry in favor of a single heavy PPC. The 'Mech makes room for this by using an XL gyro and a smaller XL engine, reducing the top speed to approximately 110 km/h. This Osiris variant has a 210 meter jump capability and is protected by light ferro-fibrous armor. BV (2.0) = 1,226[10][9]

Apocryphal Variants[edit]

Apocryphal Content Starts

The information after this notice comes from apocryphal sources; the canonicity of such information is uncertain.
Please view the reference page for information regarding their canonicity.

These variants were introduced in various apocryphal sources, and thus far have not appeared in any canonical media. From MechWarrior Online:

  • OSR-1V 
    An LRM-5 with a ton of ammo in the right torso provides long-range fire-support, while the right arm-mounted ER medium lasers remain; a Streak SRM-4 with a ton of ammo and an ER small laser provide close-range defense. Armor protection is increased to five tons. [11]
  • OSR-2V 
    This infantry-hunter variant moves the ER medium lasers to the left arm, while the right arm now mounts two flamers, with a third flamer in the center torso. A machine gun in each side-torso with three tons of ammo rounds off the -2V's weapons. Five and a half tons of armor provides excellent durability.[11]
  • OSR-1P 
    A significant departure from the Osiris' usual loadouts, a machine gun in each arm provides defense against infantry, while an SRM-4 in each side-torso and two center torso mounted medium lasers provide a powerful close-range punch. A ton of ammo feeds the machine guns, while the SRMs are fed by two tons of ammo.[11]

Apocryphal Content Ends

Design Quirks[edit]

The Osiris has the following Design Quirks:[12]

Related Designs[edit]

Dragonfly - The Osiris' speed and performance was inspired after the Clan's Dragonfly Omnimech.



  1. 1.0 1.1 1.2 1.3 Technical Readout: Jihad, pp. 56–57: "OSR-3D Osiris"
  2. 2.0 2.1 2.2 MUL online entry for the Osiris
  3. 3.0 3.1 Combat Operations, p. 127, "Force Faction Tables - Federated Suns"
  4. Record Sheets: Upgrades, p. 48
  5. Record Sheets: 3067 Unabridged, p. 74
  6. 6.0 6.1 Technical Readout: 3067, pp. 50-51, "OSR-3D Osiris"
  7. 7.0 7.1 MUL online entry for the Osiris OSR-4D Osiris
  8. Record Sheets: 3067 Unabridged, p. 75
  9. 9.0 9.1 MUL online entry for the Osiris OSR-5D Osiris
  10. Record Sheets: 3067 Unabridged, p. 76
  11. 11.0 11.1 11.2 11.3 MechWarrior Online - Civil War: Escalation Mech Pack Sale Page
  12. BattleMech Manual, p. 93 BattleMech Quirk Table - Osiris Entry.