This build is the build I use every game. I'm not going to explain every detail but I will give some reason why I picked what I did.

The runes are set up for long term survivability. Extra magic resist helps make you an anti-mage with armor to help against Adc.

Basic 21 9 0 masteries

The items are the heart and soul of the build. The items make you great team support which is always helpful. You will do a lot of damage and keep enemy mages shut down with your silence

Remember to play safe with kassadin don’t just jump in the fight wait for the right time to move in. This is the most important thing to remember when you play him. This is my first build on this site so Plz be nice or not it’s up to you.