When you cast this spell a bright flash of light is visible and all creatures or objects that are currently invisible, or affected by an illusion, within 30ft of you become visible as if the they had Dispel Magic cast upon them. If an illusion or invisibility effect is a racial, a natural ability, or caused by a spell 3rd level or lower the effect is instantly ended. However if the effect is caused by a 4th level spell or higher then make an ability check using your spellcasting ability. The DC equals 10+ the spells level. On a success the illusion or invisibility effect is ended.

At Higher Levels:

When you cast this spell using a spell slot of 4th level or higher the invisibility or illusion effect is instantly ended if its level is less than or equal to the level or spell slot you used.