As long as they dared to approach the treasure vaults, they would face the attacks of all the Great Teachings. Thus, they could only target resources that were disregarded by the major sects, such as the corpses of the deceased Heaven Prayers Sect members, searching to see if any Qiankun Bags were on them or if any relatively well-preserved Divine Weapons remained on the ground.
Or perhaps directly tampering with the Great Formations constructed by the Heaven Prayers Sect.
Although many disciples of Heaven Prayers Sect were fully aware that their sect would fail the Heavenly Tribulation, they still arranged numerous formations to confront the Sect Tribulation. Even after these formations were destroyed, some of the materials could still be salvaged.
Then there were the Cave Mansions within the Heaven Prayers Sect. Perhaps some of them might hold residual treasures.
