The Destroyer armor's possesses numerous superhuman capabilities but only if the armor is inhabited by the spirit of a sentient being. While some of the powers might vary, depending upon the spirit inhabiting the armor, they are primarily the same for any.
Superhuman Strength: The Destroyer armor possesses vast superhuman strength of unknown limits. While inhabited by the lifeforce of a sentient being, it's strength is immeasurable. It possesses enough superhuman strength to easily overpower even the likes of Thor and Hulk. Hence, it can lift far in excess of 100 tons with ease.Odin, creator of the Destroyer armor, once placed all of the combined lifeforces of the Asgardians, with the exception of Thor, into the armor, further enhancing the armor's strength to levels that make it's normal strength which is already incredible seem insignificant.
Superhuman Speed: The Destroyer armor, despite it's physical mass, can run and move at speeds greater than that of the finest human athlete.
Superhuman Stamina: The Destroyer armor is maintained by the lifeforce of a sentient being and is not subject to physical fatigue. While inhabited, the Destroyer literally possesses limitless superhuman stamina in all activities.
Superhuman Durability: The Destroyer armor is practically invulnerable to physical damage. The armor can withstand high caliber bullets, tremendously powerful impact forces, falls from tremendous heights, exposure to radical extremes of both temperature and pressure, and powerful energy blasts from the likes of Thor and Odin without sustaining damage. While possessed of the lifeforces of all the Asgardians, the Destroyer could withstand powerful blasts of energy from beings as powerful as the Celestials.
Superhuman Agility: The Destroyer armor's natural agility, balance, and bodily coordination are enhanced to levels that are beyond the natural physical limits of the finest human athlete despite it's great weight.
Superhuman Reflexes: The armor's reflexes are similarly heightened and are superior to those possessed by the finest human athlete.
Flight: Through self-levitation, the Destroyer armor is capable of flying through the air at tremendous speeds, the full limits of which aren't known. However, the armor can easily attain speed many times faster than the Speed of Sound, which is roughly 770 miles per hour.
Energy Projection: The Destroyer armor is capable of firing extremely powerful bolts of energy, primarily for destructive purposes. It has such power, that the simple energy it crackles with can shatter planets. The armor can project beams of intense heat, electricity, plasma, and magnetic force. The armor is also capable of manipulating the molecular structure of most materials and matter itself for a variety of purposes including but not limited to, transmutation such as the creation of impenetrable substances. It's most devastating weapon, however, is a beam fired from the armor's helmet, where a person's face would be in an ordinary suit of armor, that is capable of disintegrating practically any known substance in existence. The Destroyer must keep its visor lowered in order to build up the energies to use in this attack. The beam is even capable of destroying material as durable as Uru.
The Destroyer is programmed solely for battle and destruction. Only a very strong spirit can resist its programming and act on their own free will such as Thor or Odin.
While the armor itself has no weaknesses, the spirit inhabiting the armor will begin to grow more progressively violent while spending extended periods of time within the armor. Also, after a time, it becomes nearly impossible for an inhabiting spirit to maintain control over the armor while attempting to use it for non-violent purposes in non-combat situations. In time, the armor itself will dominate the inhabiting lifeforce. Only a being of extreme willpower is able to hold control over the armor such as Thor or Odin.
When battling the Celestials, the armor wielded the Odinsword.