The first place that Lin Fan's group was heading to was the Mu Stellar Kingdom.
In the report that he had read, it had been stated that the Mu Stellar Kingdom was currently being besieged by one of the smaller Beast Race tribes that had snuck away from the main army. It seemed that this Beast Race tribe wouldn't be able to gain anything if they were to attack the main Lin Astral Empire forces, so they wanted to attack the smaller Mu Stellar Kingdom to maximize their benefits.
This was a smaller tribe, so they didn't have any Ruler Experts.
This allowed the Mu Stellar Kingdom to fight back against this smaller Beast Race tribe.
The Mu Stellar Kingdom had been favoured because of how close they, or rather their Stellar King was to Lin Fan. So they had received quite a few benefits from not just the Lin Astral Empire, but also the surrounding Stellar Kingdoms.