Illusion Truth-Casting

You have gain the power to make spells from the school of illusion into reality. 

When you cast an Illusion Spell, you can expend an extra spell slot of any level to make that illusion corporealize and remain tangible until Dispelled. 

Spells that target a creature and change one or more features on that creature become physical and permanent until a Dispel Magic spell of the same level as the illusion spell used to create the change is cast. 

Spells that create objects or creatures will permanently form that object or creature and the object or creature will remain in existence even after death, incapacitation or sealing of the caster.  These creatures or objects will count as magical for the purpose of detection, overcoming resistances or immunities.

A creature or object formed from the casting of any Illusion spell cast this way is under control/ is the possession of the caster, while any illusions cast this way on an object or creature that is not already owned or commanded by the caster, become a part of that creature or object and in the case of a creature the alterations made will be under control of that creature. 

When a sentient creature is formed through this method of illusion, they will exists as long as they have a purpose or until they are harmed enough to kill it, in which case they disappear into nothing.