With Nasus, I recently started playing again, and I'm get 600-700 stacks, but everyone is running away from me. I either fight them and they run away or they all in me and I die. Nasus is too slow but my friend is essentially geting freelo with him. Is there a way to get kills quickly more efficiently?
Attackspeed?
You have used Nasus 4 times. Give it time. Also, if you really are getting over 600 stacks with him, you're doing pretty good. No one should be able to 1v1 you if you get 600 stacks.
Also don't build 
and 
. You lose too much when doubled up. Pick which one you want (I prefer Tri Force). Other than that, build pure tank.
Well, I just looked at your most recent matches with him, and in one of them you didn't build a triforce. Also, from the sounds of it, you're trying to solo everything. If everyone wants to run away from you then protect the carry, and laugh as he kills them all for you. If they all gang up on you, stay close to your team mates and let them melt the people focusing on you. If they stand and fight one on one, melt them.
If split pushing, don't chase people you can't catch and focus on towers. If multiple people come after you while split pushing, then your wards should catch them as you back off and your team gets free objectives.
My question is, how are they running away? Your whither prevents them from doing so. I mean, you're technically not supposed to go all in when they're at 100% HP either. You need to attack them a bit before. Then, when they have lower HP, then you can all in them.
Practice makes perfect.
Try running 
instead of 
, is great for the Q + finishers but will bring you more benefit in teamfights. Also like stated either or will help your mobility a lot aswell.
Consider Furor Enchancement for your boots. The Rage passive from Triforce is nice but I like the added tanky attributes from Icebourne, plus the extra 10% CDR. I'm going to consider trying Black Cleaver on Nasus as I have not done so since it's rework. Health, CDR, lil bit of durmage, and the passive. Not sure yet just speculating.
I have to ask the same question as Yaki, how are they running away?
