Team Comp for Nero Conqueror Node

Waver and Hans as support with Herc or Raikou as damage dealers. Herc is a great survivalist while Raikou can probably clear the waves no problem with her AoE np. You can also just use both and have Raikou in the first row with Herc in the back. I’d recommend Golden Sumo on Raikou or Herc if you have it, helps to bring in that np as fast as possible. If not, any other np starting or damage increasing ce on your damage dealers and an arts or np gain increase ce like Formal craft or projection for Waver and Hans so they can bring out their np buffs and debuffs more often. I’m not an expert per say, but this was basically my team comp for that level except I used Cuserker for my damage dealer and had a David on standby if Hans or Waver died.

You want Berserkers for this node. If you're lucky enough to have an avenger, use that, but Heracles and/or Raikou are your best friends here. Support them with Hans, Mash and Georgios to mitigate the amount of damage they take.

I can't emphasize Georgios enough. His three-turn taunt makes fights like this so easy, as he takes all the crits that your berserkers would normally be taking.

EDIT: Regarding CEs, you still want all the ones that increase petal drops if you're farming. A CE that lets you enter battle with a charged NP gauge for Hans would be good too.

I haven't done that node yet, because I'm still stuck trying to get my joint recitals from the shop, but as long as it's not lancer-heavy, waver/hans + tamamo + Squirtoria can probably kill almost anything (though kind of slowly). You'd want to borrow the waver though, until yours is higher level and skilled up.

For this Ruler-Avenger Conquer quest?
Borrow a Jalter then team with Tamamo and Waver
Using any taunt unit to avoid severe damage from 3 Chimeras.
Using Jalter's critical to fight versus Jalter (first priority)/Jeanne and Gils. Using Waver for NP charge.
Using Jalter and Tamamo's NP chain to Amakusa and Dantes (Jalter's NP first to Amakusa, then Tamamo to Dantes on her 2ns skill activated)

One thing for sure. Your servant is considered Premium tier, they just need leveling and ascension first, why force yourself in the conqueror node? Play the game step by step dude. Other node can produce good amount of petal ( like the lvl 60 or the lvl 80 one ). That's the function of node level recommendation.
Until you're strong enough, just gather material in the other node. Your effort will pay you!