At first, Klifon was worried about the Sunlight Beasts when they started to become too strong. They passed by a few that were definitely as strong as Saint Realm experts. He even saw one that was most likely above Saint Realm in strength. Yet, just like the cultivators previously, the Sunlight Beasts seemed to not be able to see his group.
That wasn't anything surprising. The Sunlight Beasts use Yang to identify their targets. If it doesn't comply with the environment's Yang and Sunlight Energy properties, it definitely isn't something from here. However, who was Rean? Controlling the Yang Energy around his little group was way too easy. Others wouldn't be able to do it, though. Not even the Sun Urpins.
Finally, Klifon had to accept that this place simply didn't present any danger to the twins or himself. If the beasts couldn't see them, what could go wrong?