This Forgotten Calamity Mod Boss Is Making a Return (Terraria Catalyst Mod)

The Catalyst Mod is a Calamity Mod add-on which takes place in an alternate universe that adds new items, enemies, and a superboss in the form of Astrageldon Slime.
The mod is in development and intends on adding more superbosses and biomes in the future!

Links to others who also fought this boss:

Terraria is an action-adventure sandbox platformer game developed by Re-Logic. Play Terraria Now:

[VortexSnail]

This boss is cool, wonder who made it.

[venomousslime]

2:14 it says Superbosses are post Moon Lord... but this boss proves them wrong!

[hoshinodreamer]

What is inside on Astrum Aureus?

A slime

[terra_sussy]

Ah yes

Astrageldon Glow-Up

In all seriousness, you guys finally made Astrageldon unique, before he was just 'funni instakill slime' and that was basically it

[SneckoBoi]

This is amazing! I sadly wasn't around in the calamity community to fight this boss, or even see it. The only reason I know that it exists is because of dmdokuro lol.

[daiyousei.]

I would bet that this version of astrageldon is better than anything calamity has ever -retextured- made

[PraiseHeavyLobster]

I haven’t seen this boss since the first time I played calamity

[theexiiedfeiiow]

Here before the premiere. Lemme guess, this is the return of Astrageldon. (Correct me if the meteor is still in-game and is the very thing spreading the infection) Wonder if the Astral Meteor is making a return as well. Only OGs remember those before the Astrum Aureus / Astral Infection era.

Edit: I'm as blind as a bat. The thumbnail already has a caption saying so smh...

[KuromiScarlet]

astrageldon slime:I'm back but POWERFUL MORE

[thedeuces]

By the way, just saying, this is the only scrapped Calamity boss that Catalyst mod has to offer, the dev team plans to add more calamity-related content, but no boss reworks or revivals.

Stay tuned, heard it'll be released this early march!

[MagentaNimbat]

Astrageldon! Welcome back buddy. You’re just as beautiful as the day we lost you

[purplehaze]

I'm going to voice a presumably unpopular take in saying this one fight is objectively better than literally all of the official Calamity mod.

[DanimatesYoutube]

BRO I MISSED THAT STARRY BOI AND HE'S SO COOL WHAT THE HELL
props to the devs for bringing the BOI back

[dog.b]

yo sick vid but i have one question, what is the biome/mod in the outro?

[Le_Ducc]

corrupted slime that was thrown out into space

[nullkazune]

I gotta say, this makes it worth downloading Calamity mod again just for this boss alone, props to Vortex for making a great boss for a mod addon made for the biggest yet most mediocre mod of Terraria

[happypasta]

Can we get a top 10 slime bosses because after seeing this we need one

[cat-eat-turkey]

Stopped playing terraria a while ago, should I play again? (CAUSE THIS SHI LOOKS AWESOOOMMEMEEEE)

[SlimeZ]

"Galaxy of the astral infection!"
-Astralgedon

[kaulis]

Ceiros? Who is that? The best looking boss is astrageldon slime the chaddest of them all