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.
The Hybrid Kassadin....i know you are wondering why i get a manamune, well here is the reason
In early game you should have a catalyst your sorc boots and a tear, which will give you at least around 1k+ mana about 1.5k so with manamune it will boost up ur regular attack damage and along with its unique passive u gain mana over the course of the game but that doesnt mean you keep goin AD items keep getting your regular AP items and try to keep and extra catalyst with you to boost ur hp and mana if ur low on level up. Get Rod of Ages and an extra catalyst so u basically never run outta mana by end game u should have roughly over 3k mana and about 2.9k HP with about 200+ AP and 200+ AD...sound nice huh. if u have any question just leave a comment