T1-T2 = 2 (skill cooldown -2%) (damage from -2%)
T2-T3 = 3 (skill cooldown -3%) (damage from -3.50%)
T3-T4 = 5 (skill cooldown -4%) (damage from -?%)
T4-T5 = 7 (skill cooldown -5%) (damage from -8%)
T5-T6 = 9 skill cooldown -6%) (damage from -11%)
T6-T7 = 12 (skill cooldown -7%) (damage from -14.5%)
T7-T8 = 15 (skill cooldown -8%) (damage from -18.5%)
T8-T9 = 18 (skill cooldown -9%) (damage from -23%)
T9-T10 = 20 (skill cooldown -10%) (damage from -???%)
T10-T11 = 30 (skill cooldown -11%) (damage from -33.5%)
T11-T12 =40 (skill cooldown -12%) (damage from -38.5%)
T12-10 stars is max for sonetgames, unknown if max for eleasure/ gametous.