Change player skill on champion pool

[sturdy-robot]

Today, players can't extract more than 50% of the champion's potential if the champion is not on their champion pool, and can only extract more of that if the champion is on their player pool, to a max of 100% skill level. I don't think that's a good game design feature, so I want to change this dynamic for champions on the player's champion pool. Here's how we rework it:

• Champions outside the champion pool will now give 100% of their current skill level on the current patch.
• Champions inside the champion pool receive a bonus according to the player's mastery with the champion. Champion mastery level can be leveled up, and they are divided into Mastery Ranks:
  • Bronze: Default. Champions not in the champion pool are assigned the bronze level automatically.
  • Silver: First real mastery level. Once leveled up, gives a 5% bonus to the champion's overall.
  • Gold: 10% bonus to the champion's overall.
  • Platinum: 15% bonus to the champion's overall.
  • Diamond: 20% bonus to the champion's overall.
  • Master: 25% bonus to the champion's overall.
  • Grandmaster: Last level. 30% bonus to the champion's overall.
• Champion mastery levels are leveled up with experience points. Each champion has also a difficulty level to make it harder to gain exp: Easy, Medium, Hard, Pro, God. Champions with the Easy difficulty level are pretty easy to get to the Grandmaster level in the champion pool, and they might take a few games to get max level. The God tier requires intense training sessions, and probably more than one season to get good with the champion.
• If the champion is not in the Master or Grandmaster level, they will slowly lose exp points if the player does not regularly play with them. This makes it harder to get more champions leveled up to max.

Mastery Ranks could also become stars instead of using the default elo ranks in LoL. We shall see how this panes out.