They would report the matter to the family clan, and it would be up to them to decide how to handle the matter. After all, if the person was able to enter without alerting the major family clans, this person was probably not an ordinary person. What's more, there was also the Sacred Beast that they still hadn't seen but fought against all night.
After they went back and reported their discovery to the Patriarch, several family clans gathered together and discussed the situation.
"I don't think we need to make a big deal out of this. After all, the other party hasn't done anything detrimental towards our family clans. What's more, since the other party can come to Hollow Rise Mountain quietly and bring a Sacred Beast with him, his strength cannot be underestimated. We shouldn't provoke him either!"