EpicJp21 (Say, you did the 'most advanced vessels in the galaxy' part on purpose? 'Cause these drones actually utilise tech from several eternities in the future...)
After some smaller space-time anomalies for communication between the HQ and the drones, one of them moves forward and sends a transmission.
/Transmission start/
"I have been allowed to warn you that, while your tech might be advanced in comparisation to most other forces in this galaxy, its damage potential is still oblivious when matched against our own technology.
Further annoyance will result in the classification of 'waste of matter' and lead to your elimination."
/Transmission end/
However, the lead ship recieves a different transmission, seemingly originating from their own ship's center.
Transmission start
"Greetings, forces of TIE. You likely don't know of me, but I have heard quite some stories about your leader.
I would be willing to allow your presence around this portal in exchange for a meeting with Thrawn.
Remember that you have only 4 more minutes until the drones attack and, for your own sake, don't even think about attacking them.
Simply contact the drones once you've made a decision. They will relay the transmission to me."
Transmission end