Gumo's Hideout is an area in Nibel where Gumo lives in a house underneath Moon Grotto and near the Sunken Glades. It is a dark cave with glowing mushrooms, roots, and waterfalls, and contains many moving contraptions such as moving pillars and spikes (possibly made by Gumo). The area contains Leru's Ancestral Tree, which gives Ori the ability to Double Jump. It also contains the first "mid-boss" fight and a sequence involving a rock slide.
"While Ori brought light and hope to the forest, others gave in, embraced darkness and fear" - The Spirit TreeGumo lived in his hideout during the time that the forest was blind. When he obtained the Water Vein at the Ginso Tree and has been spotted by Ori, he ran with the orb to his hideout while Ori chases after him. When Ori reached the bridge right above Gumo's hideout, Gumo activated the bridge trap, sending Ori down to the bottom of his hideout.
Ori dodged through many contraptions and traps as Gumo ran from them, activating traps along the way. At the last trap, Gumo attempted to pull the lever to activate the rock slide, but the force of pulling the lever knocked him off backwards and hit a wooden pillar behind him, causing a boulder to trap him at his feet. As Ori dodged through the rock slide trap and finally reached Gumo, Ori showed kindness by freeing him from the boulder. Gumo apologized by giving Ori the Water Vein.