So ive added a section on here about items now, I've pretty much revamped the end of the build but im not too sure of how people are going to find it works however ive been finding it works for me

I added frozen heart its very good

Yeah, play around with that a lot, I'm sure that you'll find a nice balance. Obviously as a general rule the build works, but a tanky character NEEDS flexibility.

note taken, I should add item explanations to this soon there is a reason for thronmail... I chose a general build, in some cases other items are more appropriate and yes I use them sometimes, just for the most general build not knowing the opposing team i say thornmail and banshees veil, most teams just have a heavy dps and a heavy ap to be negated but ill check out CDR and see how this helps

Please explain why you get a Thornmail rather than a Frozen Heart. Nasus runs into mana problems all the time, and a good way to alleviate that is to get +500 mana. CDR is important for both his DPSing (as all his significant damage is from Q) and tanking (shorter timer on W). Also the slowing down of enemy attack speed to me (this last part is preference-based) overrides returning 30% of their damage, especially since Thorn already adds +100 armor.

How do you improve your B.F sword you only have 1 slot left to make items by that stage... is there a different 1 item I can build only taking 1 slot to build which would be better for Nasus than the B.F sword

I guess I have to update this if you have any suggestions however this is the build I often win with

Hey dude aren't you missing something? I mean, Banshee's, B.F.and than nothing. Don't you want to upgrade your B.F.?