"That's Welderberg... Give this pipe maker coins and he'll dig pipes for you... He might not look like much, but he's a master at his specialized craft... If you've got the coins to spare, you should have him dig you a pipe..." -Tippi
He seems to be able to flip dimensions, and make gateways through them, and seems to be skilled at building Warp Pipes in little time. Welderberg can make a pipe from Flopside to Flipside for 300 coins, a pipe from Flopside Tower to the Flopside Pit of 100 Trials for 100 coins, and a pipe from Flipside Tower to the Flipside Pit of 100 Trials for 100 coins.
"This guy will dig a pipe tunnel wherever you want to go. He's a real go-getter, but sometimes he goes overboard."