ELO Before Divisions
Before the introduction of Divisions, Leagues and Tiers there was this thing called ELO, or ELO rating. (Hence why it’s called “ELO boosting” or “ELO hell” even though those words aren’t used in LoL anymore). And the ELO was just the name for the rating, it would go from 0 to 2500 or higher and the players at the very top (the now challengers) would have an ELO rating of about 2500 to 2600.
With the introduction of a new season (3) the name was changed to “Divisions” and that was to encourage players to feel more rewarded after playing and winning than just having a number attached to them, although the rating ladders were pretty self-explanatory as to who was the top person for any given season.
Divisions work a little bit different than ELO although the actual ELO still runs on the background to carry out the placement of the divisions and tiers.
The way this works is this one:
You have 5 Divisions and 1 Special one, those 5 divisions are divided into 5 tiers each that go from the lowest rating being #5 and the highest being #1.
To break it down it would be:
Bronze 5 through 1, Silver 5 through 1, Gold 5 through 1, Platinum 5 through 1, Diamond 5 through 1, Challenger.
From left to right they increase in difficulty.