Ok, I guess some tips will be needed:
1. Atlatitans spawn ONLY after you kill the Luxtructosaurus.
2. I don't think you'll be able to capture Lux, as It can destroy blocks with a large stomp, and can jump reeeeally high.
3. Tremorsilla can actually be tamed. You have to craft it's egg and then nuke it. It can be tamed with a wastedrum

I dont know what kind of options you got enabled but the primordial caves is not supposed to spawn anything but dinosaurs yet you had 500 centipedes and murmurs and the biome was very dark. Its a little lame how you were experiencing the biome the worst way possible. Normally all the mobs interact with eachother and its like a new dimension.

This is one of my favorite series. Ive always tried to make a zoo but never actually did it.

PandAce finally remembered his password 💀
Fr though bro hit us with a banger when we least expected it
Only YouTuber I know to make a wait this long worth it

Every Alex caves mob traps PandaAce

PandAce back confirmed??

And the story continues, now in the big caves

I asked for this months ago, I was waiting, almost lost hope, but You did it! Thank You so much. I love you man

i remember running into the same issue with tons of hostile mobs in the primordial caves, if you have the mod "tiny alex's caves tweaks" it messes up the mob spawns in the cave and causes there to be a ton of cave centipedes and murmurs

PandAce… Now that‘s a name I haven‘t heard in a long time

I've heard a LOT of good things about Alex's Caves, though I now hesitate to play it alongside Alex's Mobs seeing how many Cave Centipedes and Murmurs spawn in the caves. With that one cave you were in, you'd normally be able to set up a full-on base down there if you wanted. In comparison to some of the other caves, this was a fairly tame one, all things considered.

I wouldn't worry about the Tremmorzilla if i were you because it's actually very easy to tame. Yes you can tame it. The only downside is that it breaks blocks when using his attacks to walking around but you can always just make it stay by shift right clicking it.

At 16:32 you missed the golden frog, which is a really rare mob that only spawns in the primordial caves.

I’ve been waiting for you to do this ever since I saw the Ice and Fire one

Note to self: do not combine Alex mobs with Alex caves

I REALLY recommend you use the other tablets that you don't use to add to the cave compendium:

Basically, you can decipher the cave tablets and instead of using the scrolls to make a map, you can use them using right-click to add their articles to the cave compendium, these articles require like 4 scrolls from each cave to fill a cave's full chapter.

Some of these are gonna be REALLY necessary for you, or just convenient in general.

BRO AIN'T TRAPPING THE GUM WORM🗣

Imagine bro add epicfight mod to his survival series it will be hard

The best thing about you is that you do the same crazy shit that every other YouTuber does, but you have a very calm tone and don’t overreact. You make mistakes and don’t over dramatize it. It’s so refreshing to see someone like you in the space

I'm pretty sure all those cave centipedes and murmurs spawned by a glitch. Primordial caves should be always daylight bright to prevent hostile mobs from swarming the fields (exactly the thing that happened to you). When I played the mod it was all dinos there and literally nothing else.