Issue: "Caelus" is not listed on Iron's Spells 'n Spellbooks modpage as a dependancy, or anywhere on the wiki. If it is required, giving notice to users would be helpful.

Behavior: Crashed upon first Play/Load with error message
"Mod irons_spellbooks requires caelus 3.1.0+1.20 or above Currently, caelus is not installed"

Reproduce:

1. Install Iron's Spells 'n Spellbooks via Curseforge Launcher
2. Play
3. Loading
4. Crash

Minecraft version: 1.20.1

Mod version: 3.4.0.11

Forge version: 47.4.0