I'd like to see the true form of the Kelvin. I can see them being related to the Elder Things which created shoggoths...
Some of the devices used by visiting species look to shame even what you see in Warehouse 13.
The Kelvin could reduce living matter into little "cubes". Scan those with Wraith storage beams (long term transporter storage) and you could move huge numbers of beings with no need of life support.
Flint's devices, the device used in Spock's brain to cause a whole starship's crew to be knocked out non line of sight--nicer than the suffocation by the Zalkonian
ship in transfigurations.