Panic Necklace

The Panic Necklace is an accessory that can be equipped by a player. When equipped, the Panic Necklace grants the player the Panic! buff for five seconds when harmed by any source of damage besides fire blocks. The buff increases movement speed by 50%. It can be found by smashing Crimson Hearts in the Crimson biome, but it can also be obtained by opening Crimson Crates and  Hematic Crates which are obtained by fishing in the Crimson.

Tips

 * It's very useful at the beginning of the game if you have not yet obtained Hermes Boots (or its respective upgrades), as damage you take from enemies will provide a great speed boost.
 * On the one way of triggering the panic buff artificially is by using a Wooden Bow and Hellfire Arrows. Simply fire into the ground at your feet and the explosion should deal minimal damage.
 * To artificially trigger the speed buff, which is incredibly useful and better than that of boots accessories, it may be useful to have some Spikes or a Slime Statue (linked up to spawn one Blue Slime) in your arena to deal minimal damage to you but still activate the debuff. The former is not desirable as of 1.4.0.1 (unless you have the Adhesive Bandage, Medicated Bandage, Ankh Charm, or Ankh Shield), as Spikes will now inflict the Bleeding debuff which blocks natural health regeneration.

History
Collier de panique Паническое ожерелье 恐慌项链