You see an ornamented chest.
Location
In Timira the Many-Headed fight rooms.
Notes
You can get a few different items upon using it.
There are some common items and even pieces of the Naga Set that can be obtained from the chest:
Crystal Coin
Giant Shimmering Pearl (Brown)
Giant Shimmering Pearl (Green)
Giant Amethyst- Giant Sapphire
- Watermelon Tourmaline (Slice)
- Amber (Item)
- Naga Rod
- Naga Crossbow
- Naga Wand
- Naga Club
- Naga Sword
- Naga Axe
There are two different chests, the other looks like this: 