Imp Staff

The Imp Staff is an aerial ranged summon weapon which spawns a miniature Flying Imp minion that follows the player and fires fireballs at enemies. Fireballs always inflict the On Fire! debuff for 3–6 seconds and can pierce infinitely. Like other minions, the summoned Imp is invincible and follows the player for an unlimited amount of time, unless the player dies, summons a replacement minion, cancels the buff, or leaves the world.

On the Imp Staff specifically the Demonic modifier also adds the same damage as Ruthless making it slightly better because it keeps the knockback.

The Imp Staff attacks an average of once every 1.25 seconds. The delay between attacks can range between 0.75 to 1.5 seconds.

Tips

 * It is possible to obtain this weapon at the very start of the game without having to defeat a boss, giving early summoners a huge advantage. This can be done by fishing a Reaver Shark at the Ocean, which requires nothing more than a Reinforced Fishing Pole and Enchanted Nightcrawlers as bait. With the Reaver Shark, the player can immediately venture to the Underworld and obtain Hellstone in order to craft the Imp Staff.
 * As of 1.4.0.1, the Reaver Shark's pickaxe power has been significantly reduced, rendering it unable to mine Hellstone.
 * When an Imp is summoned using the Imp Staff with an enemy in its line of sight, it will usually fire. This means that continuous summoning will generally give the Imp a more consistent fire rate.

Trivia

 * The time it takes for 4 imps (no reforges) to kill the Wall of Flesh on Master Mode with Bee Armor in a For the Worthy world is 25.4 minutes, assuming every single imp hits an eyeball on every opportunity. The time taken is reduced to 15.6 minutes with a single Shark Tooth Necklace, and 11.9 minutes with both a Shark Tooth Necklace and Stinger Necklace.

History
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