Influence Point

Influence Points, or IP, are earned at the end of each game. They are used to permanently unlock Runes, Rune pages and Champions. The amount of IP gained from each match varies. You receive bonus IP for consecutively not leaving a game, for having a long game (if you lose), for having a short game (if you win), and a bonus for a Summoner's first win of the day.

Increasing and decreasing Factors

 * IP Boost x2
 * Twisted Treeline -22%
 * Non-Custom game only
 * +150 IP for first win of the day, you will only gain it when it didn't occur during the last 22 hours. (Unaffected by IP Boost.)
 * Till ~16 for fast win.
 * Till ~11 for long defense before losing.
 * Till ~23/11 for a win/lose if you haven't been counted as leaver for the last few games.
 * Custom Game -10%
 * If you are above level 10 (as Summoner), only IP gain if you didn't get some in 6 games during the last 22 hours.
 * None of the bonuses mentioned above.
 * 71 if not using IP Boost.