Hello this is my Nasus build and here's some info on it and Nasus!!!

The enigmatic creature known as Nasus came to the League from a faraway world, and served as part of a vast and learned desert empire. There he was a respected and enlightened individual, having been made the Keeper of the Great Library. However, he was also part of a race of animalistic creatures that served as the rulers and protectors of the people. War was never more than a breath away, as others of his kind craved to enslave the people and claim totalitarian sovereignty. In the midst of a heated battle, just as Nasus was about to slay his treacherous brother Renekton, he was summoned to Runeterra. It didn't take much to convince him that Champions were needed to fight against the injustice here and he took up a place in the League of Legends. These days, he is the Keeper of the Sands, feeling most at home in the crumbling ruins of the Shurima Desert.

''The Keeper of the Sands, though contemplative, is not to be trifled with.''

I choose theses runes because they help early game in raising ur shiphoning strike and u need defence early game to survive.

Masteries are for ur dps and raisin shiphoning strike

These items keep u alive and help deal damage. Boots are supose to be Ionian boots the ones with 15% less cd.

Exahaust works well for double slow on champs with ur wither, and ghost is for chasing or runing away.

Sorry if this guide is to broad made it fast and is for friend who wants to know my build fot Nasus. All u realy need to know is that with nasus u play conservative early game and last hit minnions with shiphoning stike as much as possible. use spirit fire to farm. when in fights use spirit fire thn stike and save ult till about half health.