Hello Terraria Developers,
Here is my design: The Mastermind
Backstory:
You have just defeated the final boss and a shiver goes down your spine. You stand there over the treasure bag confused, you think, "Shouldn't I be happy? I just beat the game."
But then you realize what you have done. You have been used. You understand what has happened, someone, something has used you to defeat the bosses. That something then suddenly comes down upon you and it says in a deep voice, "Thank you, my dear servant, for I am the Mastermind."
Vanity info
During the day the vanity set is a top hat for the head, a cape over a tuxedo for the torso and a belt and black pants for the legs. A special effect would be the belt for the legs shows a sprite for whichever potions the character may have in the inventory.
During the night, the vanity changes form, the top hat morphs into a black hood, the cape turns into a black cloak, and the pants turn into an apparition like the Djinn's curse (colours shown in image).
Special effects:
When the character is moving, purple spasms of light shine over the black cloak. Also when the character is moving, a black contrail is shown passing the player. This contrail may change depending on an event that is going on. For example, if it is a blood moon, the contrail will be red, pumpkin moon - orange, frost moon - blue.
A final effect would be the face that is on the hood of the character. If the character has under 50 mana it will be white if the character has between 50-100 mana, it will be green, and if the character has between 150-200 mana, the face will be blue. And lastly, if the character has 150+ mana, the face will be purple.
Feel free to modify
The backstory was just a story for the vanity.
Thanks for reading