Cause Fear Revised

Let's avoid licensed content so I can include this in a feat!

You rouse the sense of mortality in one creature you can see within range. Constructs and undead are immune to this effect. The target must succeed on a Wisdom saving throw or become frightened until the spell ends.The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Let's avoid licensed content so I can include this in a feat!