If you lose like 3-4 games at 0 LP you get demoted.
Ok so i just got into I and in my first game in b I i lost and gained +0? if i lose again, will i go back to II or gain +0 again?
@xMaJiiKs Whats your W/L, do you duo q?
You gain less LP if you're up against people who 'riot's matchmaking system' believes should be an 'easy win' for you.
Usually, people who have a negative W/L or duoq with people lower then them and lost games their MMR becomes horrible and you just end up playing with fucktards for the rest of your life.
Also, if you get promoted, you have a small grace period where you can't get demoted when you get to the next division.
It is all about MMR. If your MMR is on level of Bronze II then you will get low lp on Bronze I. You have to win couple times more than loose to get your MMR on level of Bronze I to get more than you loose.