A Golden Core cultivator leading the family disciples on their trial was enough. The Snowfield environment was a bit dangerous, but it was basically sufficient to handle any accidents.
Of course, if they encountered a Nascent Soul demonic beast, they would still have to summon an ancestor. That was the true meaning of a family trial: letting the disciples be tempered between life and death. But it was only tempering. There had to be backup ready to receive them; they could not let the disciples throw their lives away for nothing.
An ancestor did indeed have a thread monitoring this place, but to draw the ancestor's attention, they first had to activate that thread.
The Golden Core cultivator activated the thread and asked the ancestor to make a judgment. Sure enough, a Nascent Soul cultivator from the family turned their attention this way.
The Golden Crow Sect female cultivator's Divine Sense instantly caught that trace of spiritual awareness, and she released her own without the slightest courtesy. "Scram!"
The cultivators of the Seven Upper Sects had always acted rather recklessly. Now that someone was spying on their own people, it was perfectly normal for her reaction to be a little intense.
The spying Nascent Soul cultivator was only at the early stage. Sensing her powerful and pure aura, he hurriedly withdrew most of his spiritual awareness. "We are merely passing through while conducting a trial for our family disciples. We mean no offense to you, Exalted One."
Then his spiritual awareness found his family's Golden Core cultivator, and he gave him a fierce scolding. "You're neighbors with a Nascent Soul cultivator, and a True Immortal from a major sect with such pure aura at that, yet you still dare complain... Are you trying to drag the family down with you?"