Master Yi - Unstoppable

[Level 3][>] I cost [2][Calm rune] less. (While you have 3+ XP, get the effect.)[Level 6][>] I cost [4][Calm rune][Calm rune] less instead.[Level 11][>] I cost [6][Calm rune][Calm rune][Calm rune] less instead.[Level 16][>] I can't be chosen by enemy spells and abilities.