Jeff's ISS Addons
by itsjeff
Jeff's ISS Addons, a NeoForge add-on for Iron's Spells 'n Spellbooks, adds crafted scrolls, essences and spell effects to the existing spell system.
What it does
The mod extends Iron's Spells 'n Spellbooks, which must be installed alongside it on NeoForge 1.21.1. Its recipes combine vanilla materials such as lapis lazuli, amethyst shards, blaze rods, obsidian and ghast tears with arcane essence, cinder essence and common ink, so players can craft new scrolls and components.
Several spell adjustments change how the added content plays. Damage can scale with a spell's cooldown, mana use can be made optional, some spells can be disabled individually, and scrolls can deal damage to the caster instead of disappearing after use. Telekinesis is adjusted so projectiles keep the caster as their damage source.
The client and server both run the mod, so the server and every player need it. Files are published for NeoForge only, on 1.21.1, with 1.6.0 as the latest file from 2025-12-15. Source code and an issue tracker are public, but the license is All rights reserved, so the code is not open source.
Key features
Crafted spell scrolls
Scrolls are made from arcane essence, black dye and glass bottles, with alternative recipes that use blaze rods and ghast tears.
Essence components
Arcane essence, cinder essence and common ink are crafted from vanilla materials and feed into scroll and spell recipes.
Cooldown-based damage
Spell damage can be tied to the spell's cooldown, so the effect strength follows how often a spell is cast.
Optional mana cost
Spell mana use can be switched off, and individual spells can be disabled without affecting the rest.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Arcane Armor Trims is NeoForge 1.21.1 and client and server, under All rights reserved, so it is not open source, and it focuses on armor trims. Legendary Mage is also NeoForge 1.21.1 and client and server, and is open source under the MIT License. Dreamless Spells is NeoForge 1.21.1 and client and server, under All rights reserved, and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Jeff's ISS Addons | NeoForge | 1.21.1 | Client and server | 2025-12-15 |
| Arcane Armor Trims | NeoForge | 1.21.1 | Client and server | 2026-03-22 |
| [ISS LM]Legendary Mage | NeoForge | 1.21.1 | Client and server | 2026-10-11 |
| Dreamless Spells | NeoForge | 1.21.1 | Client and server | 2026-04-10 |
Questions
Does Jeff's ISS Addons need Iron's Spells 'n Spellbooks?
Does the server need the mod?
Can mana use be turned off?
In the catalog
Jeff's ISS Addons is one of 7,216 Magic mods on ModsFinder, and one of 2,992 Magic mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from itsjeff
Similar mods
What the author says
An Iron's Spells 'n Spellbooks addon. Focused on incorporating items in minecraft with Iron's Spells 'n Spellbooks and other modifications to existing spells or features.
Official listing
- Modrinth page
- modrinth.com/mod/jeffs-iss-addons
- Owner
- itsjeff
- Published
- 2025-11-24
- Updated on Modrinth
- 2025-12-15
- Facts verified
- 2026-10-15