The guardian

The guardian is a hardmode boss that can be summoned after the user has defeated the crimson/corruption by destroying all the alters and hearts/shadow orbs. After you have done that a message will appera that says "you feel and see the crimson/corruption chang." after one day of that (in terraria) then the crimson/corruption will be the unsafe whitch looks all medle and droopey. Go to the underground unsafe and destroy 3 unsafe orbs and a message will appear that says "you should have stayed out." it will summon the guardian.

Drops
unsafe sword of the gaardian %20 (weapon)

unfair advantige (accesery)

10-15 gold %100