Kolosso's Caverns Key

 is a key.

Obtaining

 * Crafted by a Handyman (Lv. 100 from)
 * 1 Aspen
 * 1 Bestial Brockhard Claw
 * 1 Gluttonous Brockhard Tail
 * 1 Gullipop Feather
 * 1 Ice Brockhard Molar
 * 1 Nightcrawling Brockhard Ear
 * 1 Obsidian
 * 1 Pyrotechnic Brockhard Ear

Uses

 * Access
 * Kolosso's Caverns