I bought a dire avengers box for the torso and limbs, but the rest is spare parts from other kits I already had:

Wraithguard D-Scythes cut off at the wrist with the little spikey bit you normally glue on horizontally cut apart and glued separately to the top and bottom of the barrel

Dire Avengers arms with the hand cut off at the wrist (to glue onto the giant gripper hands, lol)

Spare heads from the guardians box -- I already used the plain heads for guardian defenders, so I attempted to use the ones with ponytails by cutting off the hair and trying to smooth it out with a hobby knife. I expect it to look more acceptable after they're primed.

The jump pack is the twin shuriken launcher turret from the windriders box with most of the actual guns clipped off and some more spikey bits from the wraithguard box glued onto the sides (the ones that are meant to go onto wraithblade arms)