i think nasus could use some love
not an entirely functional change to his abilities, but hes currently not performing very well and could use some updates to the way his abilities scale.
hes kindof in an awkward spot compared to the other juggs, mostly due to two reasons imo. while he can grow into a midgame monster, he actually doesnt scale terribly well into lategame even with his infinite scaling, since he has no synergy whatsoever with armor penetration items.
meaning lategame his q will actually not deal a whole lot of damage against armored targets, and only really be able to chunk squishies.
hes very focused on dealing physical damage and rather itemizes into augmenting his q with physical damage, but both his e and his ult scale with ap.
he also doesnt scale really well with maximum health like the other juggs and rather itemizes into items like frozen heart and iceborn gauntlet to grab more cdr.
here are some ideas for potential updates on his scalings. this is just spitballing.
his passive: instead of granting lifsteal, it could restore a % of his missing health when he uses his q. this could be increased against champions over minions, and scale with his level.
functionally the same, but would add some % health scaling to his kit.
siphoning strike: buff duration reduced to 1 second. this would actually make it possible to deny him stacks in lane with precisely targeted cc to make the buff run out before he can lasthit a minion (cannon minion)
maybe he could get the veigar treatment and build stacks by hitting enemy champions with his q.
increase the mana cost but refund some mana for killing a unit
wither: slightly shorter duration and slow values lowered. but each time nasus hits a withered opponent with siphonig strike, it stacks up and extends the duration
spirit fire maybe have it deal physical damage to give it some synergy with cleaver? or the flat armor pen could be changed to % pen. i think this would be the ability that could allow him to scale better into lategame with some slight changes.
fury of the sands instead of burning enemy maximum health, id have it deal 1% of his own maximum health as true damage per second to enemies in range.