Hello, I am Dumbleshroom, this is my Jungle Nasus guide.
I hope you enjoy it, and you benefit from it.

Nasus' Q (Siphoning Strike) gets a buff for, whenever you kill anything with the Q, it PERMANENTLY gains 3 damage.
You're all probably like, 3 damage per thing I kill!? What a waste! Ah, but good sirs, it stacks, and the bonus is doubled against champions and bigger monsters and minions.
The point of jungle Nasus is, you farm that Q up. You use it for every killing blow when you can, soon giving you a huge damage advantage. Sure it's his only AD scaling ability, but it is worth it! The build's tankiness and damage allow you to be a great ganker and fighter, depending on how strong you are and how much damage you deal, an assassin for run off targets. Plus it applies the Q to turrets! All that bonus damage to your attack, ON A TURRET! Woo!
Now go farm that Q!

1. Start Blue buff. (for the regen and cooldowns)
2. Wolves
3. Red buff (to prevent counter jungling from them if they don't invade it)
4. Wraiths (If you feel confident/risky, take these before red)
5. Run off gank with buffs or when lanes are super pushed.
6. Don't die
7. Get kill
8. Farm Q in Jungle till ganks are ready again.

Spirit: Double Burn is so much power... the red buff from it naturally, synergizes with the red buff and your E. Creating 3 damage sources from one attack.
Taylor Swifties Boots: Constant movespeed 3, slow resistance, and homegaurd? Super mobile, but somewhat CC resistant.
Omen: Slow active and passive, good tanky
Maw: good against mages, plus shield
Mallet: More Slow and damage and health
Hydra: AOE, Damages, lifesteal

Thank you for reading, I hope this guide was enjoyable or helpful.
Good luck, and GG