WHAT IS DECAY?
If you are in Platinum or Diamond, after 28 days of inactivity in a particular ranked queue, a couple things will happen. First, you’ll be hidden from the standings in your league. You will also lose LP depending on your current tier. Every seven days thereafter, you’ll lose LP until you play a match in that queue. Diamond players lose 50 LP, Platinum players lose 35.
Master and Challenger work a bit differently:
- Each game you play in Master and Challenger tier is stored as a "banked game," up to a maximum of 10.
- Each day, 1 banked game is removed from your reserves.
- When your banked games reach 0, you'll lose 100 LP per day until you bank more games.
- Wins and losses both count toward banked games; all that matters is that you play. You can track your banked games in your profile, in the Leagues tab.
If you fall at or below zero LP as a result of decay, you’ll be placed into the next lowest division. If you’re already in division V of your tier, you’ll fall into the next tier down (for example, Platinum V to Gold I.). Tl;dr: don’t take a break from ranked for too long. :)
Decay does not occur for players in Bronze, Silver, and Gold.