IIRC, some time ago, Riot proposed, that every weak or so, we get a RGM.
... They removed it, or what?
I honestly like Oddisey, even tho I dont see people mentioning it ever.
It was the only "PvE" ("Person Vs Environment?"), good to "Chill/relax".
And the difficulty was "average/high".
The problem was the missions, keeping you away from relaxin, forcing you to get "X" champion.
(Some even involved forcing the FIVE people getting a specific champion).