There are many ways to survive a Tribulation, and magic treasures are indeed one of them. The premise, however, is that they must be treasures of life-bound dual cultivation, inextricably linked to one's Divine Soul. Both the practitioner and the treasure share the damage; while the treasure weakens the lightning, the lightning’s divine punishment in turn tempers the treasure, turning peril into opportunity.
Picking up a random treasure won't do. Borrowing someone else's hand to weather the Tribulation is equivalent to having two people standing under the lightning bolts, which would only double the intensity.
Even if one has never seen a pig run, surely one has eaten pork! In Zhao Fangce’s eyes, Lu Bei was powerful and a Sect Master in his own right. He spoke of Tribulation-crossing as if it were child’s play, and his circle was filled with nothing but Tribulation-crossing experts, never mere Body Integration stage cultivators. He surely must have seen many people undergo their Tribulations, so Zhao didn't bother to offer a reminder.
Chapter 519