And a vestige based on a book I am reading:
Spoiler: Open at your own peril
The Native Son
3rd Level vestige
Sign: Your skin takes on a dark tone, and you always smell faintly of smoke.
Manifestation: Fog covers the seal, and the smell of burning wood is overpowering. A strange machine rumbles out of the smoke, made of metal, with four wheels. A door on the machine opens, and Bigger steps out. He is a 20-year old man with dark skin, and he talks in friendly terms with the binder if he is male. If it is a female binder then he talks nervously.
You gain proficiency in Undercommon while bound to bigger. You are also proficient in improvised weapons.
Bigger's Bluff: You gain advantage on Charisma (Deception) and Charisma (Persuade) checks made on anyone of a higher social standing than you.
Mark of a Murderer: You have advantage on Wisdom (Insight) and Wisdom (Perception) checks against singular creatures.. In addition once per long rest you can add the sneak attack damage of a rogue of half your binder level to an attack you just made.
Shocking Revalation: Once per short rest, you can force on your foe a horrible revelation about the world. You must succeed on a ranged spell attack. If you hit, the target takes 2d6 psychic damage and is stunned for 1 round. The damage increases to 5d6 and the stun 2 rounds at level 10, 7d6 and 3 round stun at level 15, and 10d6 and 4 round stun at level 20.
Chauffeur: You have advantage on Wisdom (Animal Handling) checks against beasts of burden or riding animals and on Wisdom (Survival) checks to avoid getting lost.
Lung Smoke: As an action, you can force a target within 30 feet to make a Constitution saving throw or become poisoned for 1 round.
PACT INFORMATION: Bigger lived in a world that was ruled by those with "pure" skin tone, and Bigger was a chauffeur for one of the more rich "pure" households. He accidentally killed their daughter in a moment of panic and burned the body. Eventually he redeemed himself, but the gods could not get over their horror (for the gods of this world were different than the ones of ours). They banished his soul from the cosmos.