Who beats 800 stacks nasus late game 1v1
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Vayne full build in the jungle maybe? Normally beating Nasus with stacks like that takes team work and beating his team somehow before he kills your Carries. 1 V 1 is a bit rough I'd say maybe try full build only because hes ult but i dunno. Yi ult to avoid wither?

Malz works only on the condition of no QSS. LB only works as AD. Others with a chance:
(qss required, also requires very good mechanics and isn't guarenteed even then)
70% damage reduction OP, ad alistar can win.
Never gunna get in range to wither.
As AP, see above.
I mean it's veigar. You did say late game...
(ty ovenmittt)
On condition of QSS, not 100% guarenteed. (endless sorcerer)
What about melee champions

because...
BLOCK
Straight 1v1:
can do it when built and played properly.
also have potentioal
Being more useful in teamfights, allowing you to sweep his team:

Anyone capable of peeling him later in the game while their allies kill him:

A good
are a pain at all stages of the game. AD Fizz can also be annoying, though Wither helps.
General Advice:
Nasus typically doesn't build Armor Penetration, so a little armor goes a long way in mitigating his damage.
If you plan to duel him,
and/or
are great purchases, since they significantly reduce his damage to you (and in Thornmail's case negate his healing).
If you are trying to help your team handle him then
are good options to help your allies kite him, especially on characters who can easily apply the slows.
+
is a pain for Nasus in teamfights since he's too tanky to focus and applies percent health magic damage while kiting him in a teaamfight. Similarly for
and
.
[{quoted}](name=I Win Haha,realm=NA,application-id=3ErqAdtq,discussion-id=c32E6q5N,comment-id=,timestamp=2015-03-23T19:30:21.449+0000)
^
Evelynn can 100-0 nasus and not take a single hit.
800 bonus ap veigar? or a sion w/ thornmail.
If Nasus hasn't bought Quicksilver Sash, there is a very good chance
can just 100 to 0 him (assuming Malzahar is full build of course.)
Mostly because of his W and R.
Malzahar is probably one of, if not the strongest duelist in the game, if you run into him at any point after 40 or 50 minutes consider yourself dead no matter who you are (unless your LeBlanc because her passive can escape Malzahar's R)
any adc with
+
and most kite mages, just takes it time.
thresh with 800 souls i think ;3
thornmail

Yi
Anyone who out-kites, does true damage, or stuff.
Cho is a great nasus counter.