Ruined King: A League of Legends Story

Poro Holes can be accessed using Braum's dungeon ability. Make sure he is the on-screen character and interact with the hole once you find it and choose to send a Poro through. They'll bring back some treasure for you. These five locations are in Grey Harbor, Lost Bhuru Temple, Well of the Mother Serpent, Purification Temple, and Vault of the Vesani. See the video below for their exact locations. Note that the one in the Purification Temple will require you to fish up a special item to first lure out the enemy inside the hole so the Poro can successfully grab the treasure.