Lonely Island Ruins

To get to Lonely Island Ruins, travel west of Tonfon. Go past the wall entrance and stick to the north path, which will wind around and  lead to a spot where you have to use Search at. Do so to reveal a bridge. Enter it to go in the Lonely Island Ruins.

Walkthrough
The tablet in here tells us that we must control our emotion. Enter the right door and grab the chest for 321 Coins. Grab the Asura's Armor from the middle door. Go in the left door now and move the column to the right all of the way. Grab the Vial from the chest then get up the vine so you can jump on the rock column you just moved. Use Grip to get over and the vines to enter the next room.

In this next room, you are going to have to do a few things. First, move the two rock columns (One off of the column: Move it to the right. The second up on the second level: Move it to the right). Now go slap the clown.

Red Face: He will start two fires. Douse them.

Blue Face: He will start crying. Use Arid Heat on the jar of water.

Purple Face: He will have mist on top of him. Freeze the puddle to get up there and use Whirlwind to blow the mist away.

After doing this, the face will lower and you can proceed inwards to claim the Umbra Cowl as your own.

Collectibles

 * Umbra Cowl
 * Vial
 * Asura's Armor
 * 321 coins