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Kassadin Build Guide by claeson
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Try to get the blue buff after level 6 so you can spam your ultimate rift walk and all other ability he got use all abilitys you have on the golem you'll get all the mana back in no time.
When you've defeated the golem you should have the blue buff. Now you should be free to kill almost anyone in the enemy team you can look for an good opportunity and strike fast be sure that you got force pulse ready so they don't get the chance to run.