Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
It's a throwback to the pre adc changes when u get blade of ruin king after tri force.
It has no crit but u will still be doing crazy damage and you have a lot of life steal.
Because of the blade of ruin king you will start to do more physical damage. This makes it an even 50/50 magic and physical damage .