Min Damage increase changed from 2% per 3 level ups to 2% per 3 levels
This means two things: bonus damage increases 1 level earlier (on levels 3/6/9... instead of 4/7/10...) and Phantom Lancer will gain one more damage increase on level 30
Whenever an illusion of Phantom Lancer is created, it can't have less than 18% of Phantom Lancer's damage for 3s. Damage increases by 2% with every 3 Phantom Lancer's level ups