The Ihuykatumu dungeon in Final Fantasy XIV is the first encounter you unlock for the Dawntrail expansion. You gain access to it as you progress through the Main Scenario Quest and can repeat it as many times as you like for all the items you want to unlock.
Although the items you find in the Ihuykatumu dungeon are not the strongest equipment pieces for your character to use when they reach the end of the game, they might fit your particular aesthetic. You can always choose to turn them into glamour, or you might want to take note of every item you can earn in FFXIV Dawntrail for those who are collectors. Here’s the full loot breakdown of everything you can get in the Ihuykatumu dungeon.