As expected, it's the Grand Star Priest!

Rode had encountered a Grand Star Priest before at Death Ridge, who kept muttering similar phrases.

It's extremely rare for monsters to use human language, even if it's just meaningless repetition.

True monsters are completely chaotic beings, capable only of mad murmurs and no meaningful sounds. The few monsters with similar abilities can only launch mental attacks, which are essentially the imagination of your own soul and have nothing to do with the monster.