UAA Analysis of the 'Spade':
Known or Suspected capabilities:

Three of these 'alien' craft were found in the Necropolis area of Dion Base.  It is unknown how long these craft were waiting in their dormant state.  An USA archaelogy science team discovered them and inadvertly triggered them back to active status.  As a result, the USA team was dispatched by these craft.   The Spades themselves were destroyed by an elite UAA team called Fireflight.   If it had not been for the Fireflight team, the three Spades could have done far worse damage, and countless more lives could have been taken.  Despite it all, the Spades killed 13 people directly and killed another 2 with 12 injuries indirectly.

Mearsurements:
Length of body (without Tentacles): 8.28 agmers (12 meters)
Suspected Weight: 50 althos (23.7 tons); difficult to figure out as the Spades used an advanced Gravatic system.

Ordinace:
2x Sharp Claws, capable of ripping armor easily, so their Armor Pierceing.  (One Spade in a 'Claw Charge' ripped the whole left arm assembly of a Karkong-5!)
2x Head Cannons, yeild ~2-4 Kills.
4x Tentacles usually are only twice the length of the main body, but they are capable of reaching thrice it's length (36 meters).
2x Back Cannons, yeild unknown, but arguluably more powerful than the Head Cannons.

Shock Embrace, Spades when grappling a target mek, can expend a Disrupter energy that disables both pilot and mecha.  Then they use dozens of 'Micro-Tentacles' housed in their underbelly to penatrate the cockpit, and do a cocooning and lifesupport operation around the pilot.  Two explainations for this, is to create some sort of suspension of enemy pilots for later inspection, or the less acceptable, but not dismissed, is for a strange digestive system.  Further information is required to get conclusive evidence in what this operation is exactly for.   Note: This whole operation takes perhaps 12-30 seconds to accomplish, which the Spade can only move away in which time.

Defences:
They have energy absorbing feilds surronding there weak points of the 'Cyclone Sensor Cluster' or 'Cyclops-eye' at the nose of the craft, and their 'Gravatic Adomens' or 'Tail-Pod' located at the rear of the craft.

Regular armor doesn't seem as powerful.

Propulsion:
Gravatics, they move fast, and have remarkable precision.  This has been rated as 25 MA top speed.  They seem to have a FTL drive, which doubles their accelertion every 12.5 seconds, to theoretically at least the speed of light.   Additionally, it was witnessed that a Spade could snatch and turn 270 degree turn within the same hex.

Weaknesses:
Possibly below standard sensor capabilities.

Other Notes:
They are a synthesis of organic and inorganic contructs. 
Not much was left of their debris, suggesting the Spades have self-destruct capablities.
They can go to stealth, even in visual contact, and disapear from radar and light scanners through some sort of Magneto-feild bendign technology.
It is possible these Spades were in dormancy for a very long time, perhaps, 3500 years.

Everything else is unknown unfortunately.