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.
In this build I put my attention on two parameters: AbilityPower and CooldownReduction. It is could be helpfull for players who wish to Morgana casts spells more often and still very strong spells. Cooldown of DarkBinding has been decreased from 15 to almost 10 sec, SoulShackle cooldown are decreased from 100 to 70 sec, and the best (in my opinion) - reuse for BlackShield are decreased from 15 sec to almost 10 sec which give us possibility to spend almost all time in game on skill BlackShield :)
And ofcourse - REMEMBER TO USE ELIXIR OF BRILLIANCE!