"Then it is decided we need to do something about the suspicious planet that may or not be full of hybridized Klem. First, we will make a jump to head into the galactic core, far from any inhabited planet, and then we will jump into the solar system where the suspicious planet is.
Needless to say, if it really is full of Klem, there is a good chance that we will come under attack the instant that we arrive, so we will need to be ready to defend the portal so that they don't realize that we have tricked them.
Unlike the newly colonized planets, the core worlds will have Queens on them, meaning that there will be more intelligence as well as new types of life forms. They are capable of attacking into space, using energy bursts directly or dislodging asteroids from their orbits.