This time, only the medicine garden was opened in the Dan God's Secret Realm, so these perception techniques were not blocked. This allowed some sect disciples to sense fellow sect disciples within a certain range around them through the perception techniques left behind by their sects.
Lin Yi didn't ask for the Pill Immortal Master to activate these blocking measures, because they had no significant impact on his plan. These techniques could only vaguely perceive the disciples' positions, sometimes they could even be affected and lose track of them.
He just needed to control the interval of time while carrying out assassinations; if he kills the disciples of the Xuan Yin Sect, naturally he can't commit multiple murders across regions in a single day.
In doing so, the Golden Core Real Person outside would surely suspect if there is a high-level cultivator in the Secret Realm, who could move in and out freely to carry out the killings.