Arcane Insight

6th-level Divination (Cleric, Wizard)
Casting Time: 1 action
Range: Touch
Components: VSM (A clear glass lens which the spell consumes)
Duration: Concentration up to 1 hour
You touch one willing creature. For the duration, they can see through any illusion spell and know that it is an illusion spell along with who cast it. Effects such as fog and smoke do not obscure vision for the duration. The creature can tell when anyone lies to them, and know what they are trying to hide by lying.