Ap nasus is good because your ult reks peopel gais;. Buy lich bane for more damage.

Buy lich bane because spellblade sacale of of ap. This mean you cna do more damage qith qerino because of the lich. This mean you 1 shot. Liandry's and sunfire allow R to do much damages in ult due to the maximum burning. You will gain like 109090 ad from nasus ult which gives you ad while styealing enemy health. E also scales ap very well will let you win.