I'll revise Halphax later. For now, here is one of my all-time favorites:

FOCALOR
Prince of Tears
Bind DC: 18
Vestige Level: 3rd
Spoiler: Focalor
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Special Requirement: You must draw Focalor's seal with some sort of liquid.
Manifestation: Focalor manifests slowly, appearing first as a single tear that drops from thin air to strike the ground. Next his weeping eyes appear, and gradually his whole body becomes visible. Focalor looks like a handsome human male whose face is twisted by grief. He wears no clothes, but he cloaks his body in the griffon wings that grow from his back and shudder with each of his wracking sobs.
Sign: While bound to Focalor your eyes constantly weep, regardless of your mood or thoughts.
Influence: IN PROGRESS
Granted abilities:
Aura of Sadness: Each creature within 5 feet of you takes a -1 penalty to all attack rolls, saving throws, and skill checks. You may deactivate or reactivate this feature as an action.
Focalor's Breath: As an action, you may breath towards a target within 30 feet, who must immediately make a Constitution saving throw (DC 8+ your proficiency bonus + your charisma modifier) or be blinded for 1 round. You can use this ability once per short rest.
Lightning Strike: You call down lightning on a target you can see that is within 50 feet of you as an action, forcing it to make a Dexterity saving throw (DC as Focalor's Breath) or take 3d6 lightning damage. If it succeeds it takes half damage. This ability works outdoors, indoors, and even underwater.
Water Breathing: You can breath water just as well as air.