Devil Allies

You can call in devils to assist your efforts. You gain Summon Fiend as an innate spell of a tradition of your choice, which you can cast once per day. When you cast this spell, you can summon only creatures that have the devil trait. At 16th level and every 2 levels thereafter, the spell is heightened by 1 level (to a maximum of 8th level when you reach 20th level).