A Hexcasting/Iron's Spells 'N Spellbooks interop mod. Currently adds 5 hex spells that apply status effects from iron's.
The status effects in question are as follows (in no particular order):
- True Invisibility (invis that also hides your equipment)
- Angel Wings (elytra)
- Planar Sight (see mobs through blocks)
- Oakskin (pretty much Resistance but with smaller reduction per level)
- Charged (a couple of misc combat-applicable buffs)
All of the spells to apply these effects are Great Spells, and as such you will need to find their patterns in loot chests (or brute-force them).