Regardless, the Imp will still attempt to fire at underwater enemies. They stop at the water's surface and will not appear at all when the Imp is submerged in water. While the Imp can fly through water, its fireball projectiles cannot travel through water.The delay between attacks can range between 0.75 and 1.5 seconds. The Imp attacks with an average rate of fire of once every 1.25 seconds.Rounding reveals that both the Mythical and Ruthless modifiers provide the same increase to damage, increasing it from 17 to 20. The only lasting advantage a Mythical Imp Staff has over a Ruthless one is knockback. Additionally, minions cannot deal critical hits. The Mythical modifier provides the widest array of stat bonuses, but these primarily affect the initial summon rather than the resulting minion. 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. The Imp's fireballs always inflict the On Fire! debuff for 3–6 seconds, and travel in a straight line, piercing an infinite number of enemies. It spawns a miniature Flying Imp minion that follows the player around and fires fireballs at enemies. The Imp Staff is a pre-Hardmode summon weapon.