Terraria Calamity Death Mode Triple Astrum Deus [Read Description for more info]
Honestly a pain to get to even work, and still ended up as just a pretty normal Death Mode Deus fight, that's mayby a bit longer than normal, but these bosses were never intended to be spawning in multiple times over.
as a little thing, i've had or seen 4 or 5 differant ways this fight can go and what happened here was the 2nd best option, best being that the fight works as expected with 3 worms that each split in to anywhere between 2 to 6 worms. The 2nd best is that the fight is just pretty normal. 2nd worst is that the fight breaks and you get an infinite cycle of every worm spliting in to 2 no matter what you do, so it would multiply infinitly to the enemy spawn cap.
and the worst one i can remember is that you only get around 150 boddy segments that all have individually the full hp of Deus, and can't even move and are just stuck, and killing them doesn't even count as an actual kill.
So over all i'm satisfied that i got through this.
I'm using a mod called multispawn, which I have configured so it triples all enemies that spawn, so every time a Blue Slime spawns 3 of them spawn at the same time. This also works on bosses.
P.S. this mod can have some fun effects on bosses and enemies that have multiple segments or split up, since every segment or split is tripled, so you can end up with a Slime God fight with 108 Paladins (the slimes).
Put your thoughts and any questins in the comments, if something comes to mind.
Streamed at: / b0ne_r3aper