The higher layers of Gravity Falls were shorter in height than the lower layers which made their top easier to reach if one could cope with the insane gravity that is. Gnihzur was about to undertake this challenge. Although he had his worries about reaching the top of the 5th layer in one go, this wouldn't prevent him from trying.
While he was preparing himself, he noticed Origin moving about with an umbrella and inquired about it. "I've been meaning to ask about that umbrella. Why do you carry it?"
Origin told him, "This is to protect me from the heavy rain that is to come. Although I could always seek shelter inside your body if the need arises."
"Heavy rain?" Gnihzur wondered about this. "I've been climbing Gravity Falls for almost 7 months and not once have I witnessed a single drop of rain. It has been mostly sunny around here."