Yugu

A very old, and very hateful race of intelligent squid, the Yugu developed on a rogue dwarf galaxy, which has only within the last few thousand years become caught within our Milky Way. It is now in retrograde orbital decay, each pass bringing it closer inside the outer rim. It is thought that the galaxy will smash into the galactic core within the next million years, though the problem of Yugu invasion is here and now. On the second pass, they were technologically able to launch themselves from their galaxy and make landfall in the outer rim, spreading slowly with their demanding biological needs. However, after a thousand years, and only a few dozen systems colonized in secret, the second wave was able to reinforce their position and along with it, bring forth massive leap in technology. It has now been about 400 years, and the tide of Yugu invasion has expanded exponentially, the cruxians and Orion Allied Navy on two separate fronts being the only thing that has been able to halt their advance, with the looming threat of what may happen if they aren't able to be eradicated in the next 600 years...

Their motives seem to only be expansion. Expansion and to feed. In the worlds they conquer, they are quick to turn every living thing into livestock. Intelligent or not, they all become cattle to be mulched and fed upon.