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.
Swap the Force of nature with:
(if they have AD Champs i.e. Vayne, Master Yi, Etc.)
(if they have a balance of AD/AP)
(if they have CC Tanks)
But ultimately use your judgement on what you feel works best.
High AP ~620 /w Max Stacks on both rods and Mejai's
High HP ~3000 (~4000 with Warmog's)
Can Tank AND Deal massive amounts of damage
Mid-Late game champ, terrible early game
Difficult to farm early game (Must use Nevermore to farm effectively)
Must time ultimate correctly or it will drain all your mana
Well thats about it, Have Fun!!