Time for the rest of the Lokapala(God Generals in NA)?
Gonna just add them in from when we first meet them:
Lostbelt Nezha Unlike the actual listing I will do for Nezha normally, I will NOT do that here as the versions are so rapidly different, it's effectively pointless(it's implied that she's using Nezha's 2nd Noble Phantasm to get access to her weapons there but none of her skills are used).
So I'll just cover the bare basics with her save everything else for Nezha when I get to her.
Here upon Pepe's warning of their "absent friend"(Nezha), Holmes and Da Vinci warn something is plummeting at them at high speed and Da Vinci mentions it's 2 Servants.
Here, upon recognizing one of them is Nezha and the other is "something unbelievable", Nezha falls in front of them and is utterly defeated.
Here, upon seeing this "Nezha", Holmes states clearly that it's not a Nezha they have seen anywhere from Chaldeas or the Wandering Sea and comes from this Lostbelt.
Here, after the battle with the Lostbelt Nezha, she states that victory would be hers but Rama declares otherwise and she disengages once she sees Pepe and readjust her parameters.
Here, Karna states that she was more "optimized for the land"(meaning she isn't nerfed like Nezha, Karna and Rama was) and a formidable fighter to the point either one of them would had to have resorted to their TNR Noble Phantasms(Which would have destroyed the Mountain they are on regardless).
Here, Karna mentions her mobility is like "few things he has ever seen" and if Nezha didn't make contact first, Lostbelt Nezha could have caught them by surprise and critically wounded all of them at once.
Here, Ashiya states she has "World Class" Mobility and later states she has the God Kubera, Regent of the North inside of her.
Here, upon her landing(which breaks the ground which is impressive as she usually just floats) Ritsuka calls Lostbelt Nezha "Nezha" which has her warn Ritsuka to not call her that as it isn't her.
Here, Da Vinci states that while her body is Crown Prince Nezha, she's also Kubera due to the Divinity within her.
Here, upon Mash basically pointing out that regardless of the fact, she's still Nezha and should have issues with God Arjuna as a whole, when she asks how she feels about the World, "Nezha" basically tells her to shut up.
Here, upon the end of the 2nd battle(Easily able to keep pace with Ganesha, Rama, Mash and Lakshmibai at once), Gordolf wonders where "Nezha" has access to so many Noble Phantasms. Da Vinci replies that they aren't really Noble Phantasms but Baobei shown in the Investiture of the Gods but Nezha has never shown this level of fighting capability before.
Here, Pepe notes that Kubera is at the top of the list of the Lokapala consisting of directions she would be fused to, a God of Wealth and Treasure and why she has so much power.
Here, Pepe goes through the many other names he would have in India and in Japan.
Here, upon further digging from Rama on the many names he's taken, Pepe guesses that's why he's a good match for "Nezha" until she blows fire in his direction and tells him to shut up.
Here, Pepe notes that Gods having power beyond normal people is what makes them Gods(well duh) and thus infusing one with a Servant like Nezha would make them extremely strong... but heavily hints how she's using that power "hurts to watch"(Heavily implying and ultimately showing she's gonna self-destruct)
While the scene after the battle does fit with what happened, I'll leave a guide
Here on the fact that Lostbelt Nezha literally forces a self-destruction during her fight for context.
Here, practically everyone realizes "Nezha" explicitly wasted so much power and items that not even Kubera can easily replenish it.
Here, she states that Kubera is her father Li Jing(or another side of him, Syncretism is WEIRD).
Here, they basically explain Nezha's backstory and "Nezha" having feelings towards her father she can't grasp at.
Here, "Nezha" mentions as being a combo of Crown Prince Nezha and Li Jing, she knows such a combination should never exist(As Li Jing should still be afraid of Nezha and Nezha still despises her father) and why she basically burnt herself out at the fight.
Here, Da Vinci notes that due to her being a Berserker due to how her more violent side is prevalent, her feelings of her father is stronger and more prevalent than the usual Nezha(This was stated to be one of her qualifications, FYI).
Here, "Nezha" mentions because of that, she did try and not think about it... until she met our Nezha and hatred and rage over a more "true" Nezha existing caused her to savagely murder her.
Here, "Nezha" fully notes she killed herself, not anyone else
Here, "Nezha" ultimately notes that there are only 3 Lokapala operational and has no idea where the others are and Pepe notes that there are actually 8 for each direction(So I actually should change that around with Ashwatthaman to begin with lol).
Here, she notes the directions they actually guard(and again Ashwatthaman is left out as he isn't really one)
Hmm, I may have to actually stretch out the remaining Lokapala as Character Limits can be a bitch(80K Words is hilariously not alot)... or maybe stop taking so much goddamned time for other random shit.
TL;DR Lostbelt Nezha is a surprisingly strong and fast version of Nezha normally is. She can murder a weakened Nezha with ease but only really stalemate multiple Servants that are aware of her at similar levels. The final battle had her completely throw the fight so we have no clue how truly powerful she was but considering Karna's words, people would be dead, plain and simple. Makes sense as Nezha herself is no slouch and we'll get to that later.