My Build allows Kassadin to dish out more spells without having to go back to Base to Regen his mp, most people would rather get Rod of ages rather than Archangel's Staff for survivability, which isn't bad but once you play enough you get good enough to not need that extra HP...
so for new players i recommend rod of ages for awhile then when you feel nice and comfortable switch to Archangel's Staff...
as for Leveling up your skills, i wasn't entirely sure on the order but ill list the order that you want to get them in...
1- null Sphere
2- Force pulse
3- Force pulse
4- null Sphere
5- Force pulse
6- rift Walk
Force pulse>Null Sphere>Nether Blade
and obviously Level rift walk whenever available
the reason for this is simple, Force Pulse is the source of your huge burst damage, i cant tell you how many times i see ap kassadins fail because they don't upgrade force pulse before null sphere and or waste points on Nether blade...
with my build nether blade is nearly useless as the mana Regen is more than enough to unload your combo, escape, wait in the back and do it all over again...
- How To Play -
You are weak you are weak you are weak, keep telling yourself that and it will save you from death. until you get your ult you are no threat and are a free kill to anyone if you dare attempt to go for a kill, so farm farm farm until then.
Now you are in serious Business, around this time you should have your soul stealer and you should be teaching the opposing team who their daddy is...
1- Never go in with low health unless its a sure kill
2- always have force pulse ready to unload on their arse
3- Exhaust/ignite are your best friends
Rift Walk(lich Bane Proc)>Hit>Null Sphere>Force Pulse(Lich Bane Proc)>Hit>Rift walk away...
Rift Walk(lich Bane Proc)>Hit>Exhaust>Null Sphere>Force Pulse(Lich Bane Proc)>Hit>Rift walk away...