
Vampirism Iron's Spells Compatibility
The Vampirism Iron's Spells Compatibility addon blends Iron's Spells 'n Spellbooks magic system with Vampirism's bloodthirsty features, creating unique spellcasting exclusively for vampires. The main advantage - complete compatibility without conflicts, as integration works through runtime reflection without modifying the parent mods' source code.
Key Features
Blood Magic
The system replaces regular magical energy with vampire blood. When a vampire is well-fed, spells consume both mana and blood simultaneously. If blood level drops below minimum threshold, the spell doesn't require blood but becomes significantly slower due to increased recovery time.
Modified Spells
Ray of Siphoning damages enemies while replenishing the caster's blood supply. Devour restores a large blood portion at the cost of increased mana consumption.
Holy Magic Vulnerability
Vampire casters take damage from using holy spells, while sacred attacks deal double damage to vampire mobs. Healing spells from the holy school turn into pure damage against vampire targets and the caster themselves. Supportive holy spells - like Angel Wing, Sunbeam, Fortify, Wisp, Haste, and Cleanse - cause minor damage to vampires and automatically cancel.
Configuration & Compatibility
The addon is fully customizable through simple server-side configuration, allowing adjustment of blood-to-mana ratios, threshold values, cooldown multipliers, and holy backlash parameters.
Simple installation - just add the jar file alongside Vampirism and Iron's Spells without additional requirements or changes to original mods. No compilation dependencies and no extra resources needed.
Download
Dependencies

Iron's Spells 'n Spellbooks
1.18.2 — 1.21.1