No Lore section? NO PROBLEM!!! Let's talk about it here! Cannon, non Cannon.. Fan fiction..BRING IT!
The darkness fades, there YOU are on a dyas surrounded by 4 others... WELCOME TO SUMMONERS RIFT
What happens prior to this? Are the champions held in captivity? Kind of like gladiators during the roman era? They train, sit around and wait, and then when they are selected, it's game time.. And ZAAAAP!!! They are beamed into the rift?
The rift itself... Is it an arena? Is it an actual location set somewhere in the world?
What happens after the match? What do the champions do? Do they live the whole gladiator stable life? Do they go back to their real life, family, region, friends?
The way I picture it is.. Every champion In The League was something special when they were alive... General, soldier, sell-sword, assassin, mage... Upon their death, their soul has to atone for deeds done during their mortal time. The league is a consciousness for their spirit..where they can battle eternally, again and again... Life, family, friends, means nothing.. They are allthere, in their minds, they are aware they exsist.. However they are unable to focus on them, unable to go to them, and there is really no need to. The only thing that matters is that when they are selected... Let the battle begin.
New champion enters The League? Another worthy champion has shed their mortal shell.