Riot Games kicked off another period of Essence Emporium, allowing players to get rid of Blue Essence but also to let them obtain 30 Mythic Essence at no extra cost.
League of Legends occasionally gets the Essence Emporium, allowing the players with too much in-game currency to obtain a few cosmetics and the currently-running one is staying until July 12, 2022.
Besides being able to purchase some of the more expensive cosmetics such as Urfwick, which will set you back 150,000 BE, the players can this time around earn Mythic Essence for those extra fancy skins on rotation.
There is no purchase required for the ME, only that you complete three missions, the first one requiring you to play five games. Overall, this should get you about third of the way to purchasing a Mythic skin so it's not a bad thing to have around.
On the side of not-so-good news, Essence Emporium will stop appearing for a while after this one closes. The reason is that Riot Games want to either overhaul it or simply change a few things, it currently doesn't sound like they've settled on any single idea about the store.
In any case, EE will not appear for a longer period but the team reassured the players that it's not a matter of "if" but rather of "when" the Emporium will open once again. Let's hope some new will be purchasable when it happens.
Meanwhile, if you are not looking forward to the trouble of obtaining Ashen Knight Pantheon skin, you might as well just get Ruined Pantheon and then use the chroma from the Essence Emporium. The differences are minimal and it saves you the trouble of collecting enough Mythic Essence for lacklustre skin.