This mod is an Iron's Spells & Spellbooks addon that add some funny things, including a new evocation subschool called illusion school, a couple cool items and some interesting spell traps.

Illusion subschool spells (all of them work different when casted on players since that's their main utility):

Distort: creates a strong distortion in the target's eyes, making him see entities in sizes that shouldn't be possible. Only works on players.
Empty World: casts an illusion on the target to make him see the world empty. On non player targets it will freeze them in place.
Wonderwall: creates an illusionary wall ahead of the caster for 30 seconds, making entities lose track of it.
Paranoia: casts a strong illusion on the target, making it suffer from hallucinations for some time.
Fear Bolt: casts a bolt filled with illusion magic that makes the target see what he fears the most in this world.
Disguise: casts an illusion on yourself to look like the entity you want (if an entity behaves weirdly when disguised as it, feel free to blacklist it using the disguise blacklist tag).
Squish: casts a powerful spell that makes the target body squish in various ways (if an entity behaves weirdly when squishing it, feel free to blacklist it using the squish blacklist tag).

Items:

The Trapwright’s Grimoire: a book that can be imbued with some spells. When right clicking with this book and a bound spell, you will place a spell trap of the imbued spell that lasts forever, but has higher cooldowns between casts.
Picture Book: a book that lets you store up to 8 disguises. Press the correct keybind with the book in the mainhand to open the selection menu. Right click aiming to your target with a disguise spell in the offhand to consume it and save the entity disguise in the selected slot. Normal right click to disguise as the entity in the selected slot. Works with players.