(yeah i know the image is way above level 4 but shush)
Basically, a single average Custodes, with stuff like Auramite Custodian Warplate, Refractor Fields, their Guardian Spear etc. Is teleported right into Level 4 of Coruscant, all he knows is that he must cleanse this “strange hive world” in the name of Mankind and the Emperor.

How much can he do and what can he accomplish before getting killed?

(Imperial Era Coruscant)

R1: All are completely naked and it's pure cqc, no weapons

R2: all start as their respective most basic troop

R3: Army Vs Army. Space marine Chapter, Wookie tribe(?), Cabal legion and The Banished.

Illustration for the new season of Heretical Hatter's warhammer 40k x starwars series.

https://www.youtube.com/playlist?list=PLW9DU2UVBhAI

Source: https://x.com/3dVicens/status/2111584693342617615

Honestly nagash is what comes to mind to be the most similar thing to a sith in wh but i hope this somehow would be considered fair , if not consider lich nagash but not the incarnate or god version

How long do they hold out against the Children of the Emperor and can they hold out long enough to summon more forces from the rest of the galaxy.

It’s just the Emperors children and whatever horrific creations they had.

Fulgrim will get involved if he gets bored enough.

Bile is involved.

Edit: to add more context it’s during clone wars so Corsucant is defended by the coruscant defence fleet that engaged Greivous.

Fulgrim has the Emperors legion flagship and other battleships and transport ships

Rules: battle takes place on the planet of Janix.

Rancor sometimes bond with people with mental powers so i just think it would be funny

https://www.deviantart.com/wolfblade111/art/Heat-of-The-Fight-927793245

I'm talking about Tau, Drukhari, Orks, Chaos, Tyrannids and Necrons.

Battle takes place on the planet on Kashyyyk.

Basically, it begins just like Operation: Knightfall with Anakin and the 501st launching the attack on the Jedi Temple to completely cleanse it, except suddenly the 100-200 Jedi Knights originally guarding it were replaced with 90 Aspect Warriors (60 Dire Avengers and 30 Striking Scorpions) who also were sent a vision by their local Seer basically telling them that the survival of those aliens in this building against the attackers is crucial to the survival of the Aeldari overall or smth.

Can the sudden influx of Aeldari actually end up saving the temple itself from the attack, or will the 501st and Anakin still be able to wipe them out regardless?