The Lockblade.
It looks more like a Keyblade though.

I already like this update even though I don't have it.


EDIT:
Wow, it sure looks different!
I finally got the update. That's gain, right? ;P

EDIT EDIT:
Okay.
So far, I haven't encountered any Corruption, instead getting only Crimson.
I'm scared of the place now
It may as well be a Flesh biome; Crimson monsters drop Vertebrae and apparently there are Hearts replacing Shadow Orbs.

To the west of my base, there's a Crimson biome.
To the east, a Crimson biome overlapping with a Snow biome.
Downward, a lot of water.

Upward... well, that's my next destination!

EDIT EDIT EDIT:
Okay.
My first world is Irova, my second world is Sylraphia.

Irova is mentioned above, of course.
Sylraphia isn't.

Fighting the monsters of the Crimson is very hard with just a wooden sword
On Irova, I almost ended up destroyed by a Crimera.

Sylraphia also has Crimson instead of Corruption, but I beat Skeletron, the Brain of Cthulhu and the Eye of Cthulhu using a character called "Shaie" that I used prior to the update.
I already have 8 NPCs, so I can get the Party Girl NPC soon, probably. Unless she requires the game to be in Hardmode.