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Asterism Arcanum Addon adds a brand new school of magic for the Iron’s Spells and Spellbooks mod. It focuses on the Astral School, which gives you tools to stay far away from danger and dodge attacks easily. This expansion brings new spells, unique creatures, and a mountain structure to explore. You can cast light magic, ride giant moths, and fight off flying bugs to gather magical crafting materials. It is a great choice for players who prefer to keep a safe distance during battles.

Asterism Arcanum Addon for Iron's Spells and Spellbooks Mod

Features:

  • Astral School: Adds a new magic type focused on running away, dodging damage, and keeping distance from targets.
  • Astral Observatory: Generates a new building on top of mountains where you can find the Astromancer NPC and new blocks.
  • Lunar Moths: Introduces friendly giant moths that spawn on steep peaks or hatch from eggs dug up by Sniffers.
  • You can ride the Lunar Moth as a mount or summon one to protect you using a special spell.
  • Hostile Dragonflies guard the abandoned observatories and drop their wings when defeated.
  • Players use Dragonfly wings to craft astral spells and new building blocks like Lumine.
  • The Astrolabe item works just like a normal spellbook to hold your new magical abilities.

Astral Spells:

  • Astral Echo teleports you away, but enemies can reverse it if they hit the light ball in time.
  • Brightburst pushes away and hurts any mobs standing too close to you.
  • Celestial Tether locks you in place, even in the air, and stops all incoming damage.
  • Star Swarm shoots a massive group of projectiles exactly where you aim.
  • Luminous Beam fires a long, skinny laser of light that damages everything it touches.
  • Silvery Barbs protects your pets, allies, or summoned creatures right before they take a hit.
  • Starcutter creates a ball of light that explodes very quickly to deal damage.
  • Starfire lobs a small ball of light that pierces and bounces between enemies.

How to Use:

  1. Climb to the top of tall mountains to find the Astral Observatory or wild Lunar Moths.
  2. Fight the Dragonflies inside the observatory to collect their wings.
  3. Use the Dragonfly wings to craft your new astral spells and runes.
  4. Hold the Astrolabe item in your hand to use it as your main spellbook.
  5. Watch your Sniffers dig in the dirt to find hidden Mothspawn eggs.
  6. Throw the eggs to hatch new moths or use them to apply effects to enemies.

Screenshots:

A player holds a Celestial Staff in front of a stone observatory
A player holds a Celestial Staff in front of a stone observatory
The player rides a giant glowing Lunar Moth over a stone bridge
The player rides a giant glowing Lunar Moth over a stone bridge
A large stone astral observatory with a green dome and stone bridges
A large stone astral observatory with a green dome and stone bridges
Wide view of a stone structure with walkways over a grassy landscape
Wide view of a stone structure with walkways over a grassy landscape
A player uses the star swarm spell on a stone bridge structure
A player uses the star swarm spell on a stone bridge structure
Translucent lunar moths fly across a stone walkway in a mountain biome
Translucent lunar moths fly across a stone walkway in a mountain biome
Hostile dragonflies flying around an abandoned stone observatory in the mountains
Hostile dragonflies flying around an abandoned stone observatory in the mountains
Player casting star swarm spells with a magical item in a forest
Player casting star swarm spells with a magical item in a forest
Player casting a bright astral spell with glowing particles in a forest
Player casting a bright astral spell with glowing particles in a forest
A player riding a giant Lunar Moth from the Asterism Arcanum Addon
A player riding a giant Lunar Moth from the Asterism Arcanum Addon
Player firing a glowing astral spell from an astrolabe in the mountains
Player firing a glowing astral spell from an astrolabe in the mountains

Requirements:

NeoForge RequiredIron’s Spells ‘n Spellbooks Mod Required
Ace's Spell Utils Required

ExpandAbility Mod Required

AR – Azurelib Required
Aces Spell Utils Required

AzureLib Armor Mod Required

Asterism Arcanum Addon for Iron's Spells and Spellbooks Mod Download Links

For Minecraft 1.21.1, 1.21

NeoForge 964 KB Aug 11, 2026

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