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.
How do I play?
This guy is a lot better at explaining it then I am:
I only made these builds because he missed off (IMO) 2 of the best off-tanks in the game, sion and poppy. So I added them here with my own personal irelia build as an alternative to his if anyone wants to try it, not much difference tbh, I usually don't bother with FoN as I prefer the move-speed passive.