1000 Coins [COMMON] - "No comment."
Brown Fur [COMMON] - "A bunch of soft brown fur. Used to craft the Winter Jacket (Required to go to the Mountain)."
Broken Blade [UNCOMMON] - "The blade of a Manticore. Used to craft multiple weapons."
Dog Tears [UNCOMMON] (Empty bottle needed) - "Looks like the poor guy's been crying a lot. Required for the Quest 'No Sympathy'."
Manticore Tooth [RARE] (Wearable) - "How'd you get this? Used as a charm to decrease damage taken by fire spells."
Little Pink Flower [RARE] (Wearable) - "Looks like he's been guarding it... not sure why though. Used as a charm to increase damage when using floral spells."
Aqua Wings [LEGENDARY] - "Wings that couldn't fly. Used to craft the Legendary Paraglider."
Also I think Trent would be the Gatekeeper to the Mountains, but if you don't fight him he'll cut off some of his fur so you can still craft the Winter Jacket. The Dog Tears would be similar where if you return to the Gate, Trent would be crying and you can ask him to give you some tears. He'll agree, and if you comfort him he'll give you the Little Pink Flower. Just a lil thought lol