This modpack is discontinued. For a version that's up to date, go to Polar's Boss Rush 2. It's basically the same thing, just in 1.20.1.
Why did I do this?
The last few times I tried to play this modpack, it kept crashing, and as I tried to find out why, I noticed Archaeology API (which was required for L_Ender's Cataclysm) was nowhere to be found except my modpack. It seems the mod was deleted, so the game crashed trying to load a mod that didn't exist. I would have to remove it, and by extension, L_Ender's Cataclysm, in order for it to work again.
Cataclysm is one of the most crucial mods to this modpack, so I searched if there was something, ANYTHING else I could do, and it turns out all the most important mods are now in 1.20.1, in which Cataclysm does not require Archaeology API, so I made a new modpack for that version.
This modpack includes some of my favorite mods that give more bosses to fight, along with the ones from Vanilla Minecraft. There's also lots of dungeons with tons of loot to prepare for those bosses. Keep in mind those dungeons also have a bunch of monster spawners. It is recommended that you get to know the mods I used before you play this modpack.

