So after 45 hours, a bunch of triples, one quadra and a single Penta I got Nemesis diamond. So I figured I'd try to help y'all out a bit.
Scales of Fate: Nemesis holds the Scales of Fate. When she basic attacks enemies, she steals a portion of the enemy's physical or magical power and converts it to her own physical power. Stealing magical power only converts half of it to physical power, as mages have around 4 times more power than physical gods. This stacks 3 times and steals 3% of the enemy god's power.
Swift Vengeance: This is an ability similar to Bastet's leap, in that Nemesis can dash again with 2 seconds. the difference is while Bastet leaps back to her starting point, Nemesis can dash in any direction. Using an ability after the first dash will cancel the second though. The dash deals 50/80/110/140/170 (+25% of your physical power) to all enemies hit.
Slice and Dice: Nemesis claps her sword in an almost 180-degree cone around her, dealing 40/65/90/115/140(+25% of your physical power) if you hit on the edge and 80/130/180/230/280(+50% of your physical power) and a 30/35/40/45/50% slow if you strike in the center.
Retribution: This is probably one of the best abilities in the game. Nemesis gains a shield that absorbs up to 100/200/300/400/500 damage and reflects 30/35/40/45/50% of all damage taken, and healing Nemesis up to the 500 threshold. That means the maximum healing/damage reflect you can do is 250. Which is still solid.
Divine Judgement: This is only one of 3 abilities, I believe, in the game that cannot miss. You have to have an enemy god targeted to use it, and it does a lot. It does 30/35/40/45/50% of the enemy god's current health has damage, increases Nemesis's movement speed by 25%, and steals 30/35/40/45/50% of the god protection for her own.
I start out Bumbas Mask and HoG 2 for quicker jungle clear. With those two item, along witha health and mana pot, I head to speed with my solo laner, then chill with him in lane, clapping the minions when I can. Usually I will head to back harpies around 1:45 or so, then rotate to mid in preparation for mid camps and to share some farm with the midlaner. from there, I go to the duo side back harpies, then either return to base for boots or poke my nose in on duo lane.
From extensive testing my personal favorite build for jungling is Ninja Tabi, Jotunn's, Asi, Qin's Sais, Rage and Deathbringer. Once you pick up Asi and Qin's you can usually chase enemies and stay in the fight for a bit longer, as you have very nice damage, especially as the tanks health is starting to ramp up, and the enemy midlaner's Warlock's Sash starts to stack as well, along with some sustain.
When I gank a lane I like to initiate with my ult, then hit them 3 times to max out my passive stacks, then clap them. By that point they're probably very close to dead, so you can clean up with your dash if they peeled a bit, or just another basic attack. Remember your shield. I cannot stress that enough on Nemesis. It's going to save your life when you're attacking the ADC late game. he starts throwing basics at you, you can pop your shield while you engage and get some damage off while keeping yourself alive. but once you close with him, it's over for basically anyone except for an Arachne. That's probably Nemesis's biggest counter because she can hit you with that stun before you can kill her. So play safe against an Arachne, i hate her so much. And remember: don't be afraid to pop your shield and tower dive. See someone who's low at the back of their tower? double dash, shield and clap then, then run into their jungle to safety.
I dunno what else I should put, so I'll leave this here. If you have any questions feel free to ask, I may or may not have an answer.