Plagiarized Textbook (School of Illusion)

You have gotten your hands on a copy of a teacher's edition textbook from the School of Illusion. While holding this book you and the spells written in it benefit from the following effects: 

Improved Minor Illusion

You learn the minor illusion cantrip and it doesn’t count against your number of cantrips known. When cast you can create both a sound and an image with a single casting.

Malleable Illusions
Starting at 6th level, when you cast an illusion spell from the textbook that has a duration of 1 minute or longer, you can use your action to change the nature of that illusion (using the spell’s normal parameters for the illusion), provided that you can see the illusion.

Illusory Reality
By 14th level, you have learned the secret of weaving shadow magic into your illusions to give them a semi-reality. When you cast an illusion spell of 1st level or higher from the textbook, you can choose one inanimate, nonmagical object that is part of the illusion and make that object real. You can do this on your turn as a bonus action while the spell is ongoing. The object remains real for 1 minute. For example, you can create an illusion of a bridge over a chasm and then make it real long enough for your allies to cross. The object can’t deal damage or otherwise directly harm anyone.