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Kassadin Build Guide by Fuzzybuzzkillz
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Now to why is this good?
You can get insanely good ganks with your R at level 6 since you can jump over walls then just continue to follow them in lane with it since it only has a 6 sec cooldown(without CDR), you also have your burst with W and E.
And Kassadin is just generally great against squishy teams so try and pick him when you see that the enemy team doesn't have enough tanks or tankyness.
You need to get some HP back from Scuttler with your Machete so you can take on Blue Buff, you will probably die if you don't.
And you start Krugs since you can Auto attack cancel with your W (Auto attack then right after press W) and get 2 hits in easily, your W costs 0 mana so you don't need the extra mana regen.
After you've done your route you should go recall and buy your Tear of Goddess and Hunter's Potion, you should have pretty much exactly enough money.
Other than that your W will stack it for no cost during your whole game.
You don't really want to upgrade your Tear to Manamune until you have 750 stacks since it doesn't do much for you until it's a Murmana.