Astronimus adds several bosses into the game. As of v0.9.6, the mod adds 6 bosses, all of which take place in Pre-Hardmode.
Pre-Hardmode Bosses[edit | edit source]
Terrum, the Earthen Guardian is the guardian of the earth with 1000 / 2000 life. It is meant to be the first boss the player encounters and is a simple, but somewhat tricky fight.
Mar'Isa, Abyssal Empress is the empress of the ocean with 3000 / 4800 life, meant to be fought after the Eye of Cthulhu. She drops a material needed for Cygma's summon
|File:Frost Wyrm (Astronimus).png||
The Frost Wyrm is a post Eater of Worlds/Brain of Cthulhu worm boss fought in the snow biome. It has very high damage and can be quite difficult due to the myriad of debuffs it can inflict. It drops Frost Scales that can be combined with Dune Scales from the Dune Raider into Dune Frost gear
|File:Dune Raider (Astronimus).png||
The Dune Raider is a post Eater of Worlds/Brain of Cthulhu worm boss fought in the desert biome, serving as a counterpart to the Frost Wyrm. Unlike its counterpart, it trades damage for defense, with the head being the only segment that takes reasonable damage. It drops Dune Scales which can be combined with Frost Scales from the Frost Wyrm into Dune Frost gear.
Vecna[edit | edit source]
Vecna, the Whispered is a post-Skeletron lich-themed boss fought at night. He will float around casting bolts and shadowflames while his hand and eye will summon minions and fire Lost Souls, respectively.
Cygma[edit | edit source]
|File:Cygma Head (Astronimus).png||
Cygma, Daughter of Andromeda is the final modded boss of Pre-Hardmode. She is a giant slow-moving worm boss that focuses on firing several, powerful attacks that inflict movement-restricting debuffs in an effort to get you to be hit by her mouth, which will instantly kill you.
Hardmode Bosses[edit | edit source]
|File:Terrum, Planetary Defender (Astronimus).png||
Terrum, Planetary Defender is a rematch against Terrum, meant to be fought just before the Mechanical Bosses. As of the current build, he behaves exactly the same as his pre-Hardmode counterpart, with higher stats and a different sprite.