Polarities Mod/Ghostwriter

The Ghostwriter is an NPC vendor that will spawn once the following criteria has been met:
 * There is an empty House.
 * Any boss from vanilla Terraria or the Polarities Mod has been defeated.

She sells, a new class of tools that provide mutually exclusive boss-themed buffs after each associated boss is defeated, and miscellaneous items related to them. She cannot defend herself against enemies, but also does not take any damage from any enemies other than ghosts, wraiths, and reapers in exchange, simply passing through harmlessly.

Names
The Ghostwriter may have any of the following names:
 * Anne
 * Harper
 * Jane
 * Mary
 * Shelley
 * Terry
 * Ursula

Quotes
After Eye of Cthulhu is defeated: After Skeletron is defeated: When Arms Dealer is present: When Tavernkeep is present: When Clothier is present: When Stylist is present: When Mechanic is present: When Angler is present: When Wizard is present: When Santa Claus is present: When Guide is present and the world is in hardmode: When Dryad is present and the world is in hardmode: After The Twins have been defeated: After The Destroyer has been defeated: During the Blood Moon: During the Frost Moon: During Halloween: During Christmas:
 * "I wanna go home."
 * "My ability to touch things is very inconsistent."
 * "Do you have any book recommendations? I'm always looking for new things to read."
 * "I see everything... muahaha..."
 * "The books in the dungeon were mine once, but they've fallen apart in the damp environment."
 * "Yippee ki-yay, mother-"
 * " is from another dimension? Sounds like a crossover to me."
 * "Give  a hug for me, okay?"
 * " likes me. I think it's because I can eavesdrop on everyone."
 * " is officially my mom until my real mom gets back."
 * " is such a jerk!"
 * "I tried to borrow a book from  once. It did nothing. I was quite disappointed."
 * "I told Santa Claus that I don't celebrate Christmas. He was very understanding."
 * " and I are a lot alike. Except for the part where I'm a ghost. That's a pretty significant difference."
 * " says the Hallow is good and only exists to cleanse imperfection. For someone so old, she's quite naive."
 * "My Retinazer/Spazmatism fic is coming along well. Thanks for asking. Why are you turning green?"
 * "I am become Death, the destroyer of worlds. Oh, it's from something I read."
 * "Everyone seems really on edge. I don't see what the big deal is."
 * "What in the world is all this?"
 * "Boo!"
 * "I don't celebrate Christmas, but it's nice to see everyone so happy."

Trivia

 * A is a writer hired to write something credited to another person.
 * Several of her lines suggest she is actually a child, which may explain her near inability to die, similarly to the Angler; ironically, as a ghost, she is technically already dead.