Merchant

The Merchant is an NPC vendor that will spawn once the following criteria have been met: Destroying the Merchant's home will not cause him to leave, though it will leave him vulnerable to enemies.
 * There is an empty house.
 * A player acquires 50 Silver Coins.

Once the Merchant has moved into a house, he will sell the following:

* Only after your player has max mana.

** Only sold at night.

*** Only sold during a Blood Moon.

**** Only sold after Skeletron is defeated.

Note: As with all NPCs, right-clicking an item will allow multiple purchases rather than purchasing it one by one.

Quotes
Note: The Merchant has quotes that change depending upon the time of day, and has a couple for each time period.
 * "Sword beats paper, get one today."
 * "Kosh, kapleck Mog. Oh sorry, that's klingon for 'Buy something or die.'"
 * "The sun is high, but my prices are not." (Only afternoon)
 * "Boy, that sun is hot! I do have some perfectly ventilated armor." (Only afternoon)
 * "Did you say gold? I'll take that off of ya'." (Player having a gold coin in a coin slot.)
 * "I wonder if the moon is made of cheese... huh, what? Oh yes, buy something!" (Only at night, Wallace and Gromit reference)
 * "I hear there's a secret treasure... oh never mind."
 * "Angel statue you say? I'm sorry, I'm not a junk dealer."
 * "Lovely morning, wouldn't you say? Was there something you needed?" (Only in the morning)
 * "Ah, they will tell tales of [Name] some day... good ones I'm sure." (Only in the evening)
 * "Night be upon us soon, friend. Make your choices while you can." (Only in the evening)
 * "Have you seen Chith...Shith.. Chat... The big eye?" (Only during Blood Moon, referring to the Eye of Cthulhu.)
 * "Keep your eye on the prize, buy a lense!" (Only during Blood Moon.)
 * "[Name] is it? I've heard good things, friend!"