Eldritch Vision

You choose a creature within range and reveal the horrors of the void to them.
When you cast this spell, choose one point within 10 ft of a creature within range, where an illusory Eldritch Horror appears. It is insubstantial, does not move and does not create any noise.

This spell uses a bit of brain matter as the material component. The more intelligent the creature the matter came from was, the more powerful the spell becomes. The target must make an Intelligence Saving Throw against your spell save DC, +1 point to the DC for each 2 points of Intelligence the creature had over 10 and -1 point to the DC for each 3 points of Intelligence the creature had below 10. 

If successful, the target is unaffected though it can still see any eldritch horrors, taking 1d4 psychic damage plus 1d6 psychic damage for every 2 points of Intelligence the brain donor had. If the target fails the saving throw, it takes twice this psychic damage and perceives the Eldritch Horror as a monstrosity about to attack it, becoming frightened for the duration. Whilst frightened the creature must use its movement to flee the Eldritch Horror for the duration of this spell. The creature can use an action to make an Intelligence Save against your spell save DC to reveal the horrors as an illusion.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you summon an additional Eldritch Horror for every level above 1st, which the caster can place at one point within 30ft of the creature.