The Flamelash is a Spell weapon that summons a flaming projectile that can be controlled with mouse movement. It is the second tier of missile spells: stronger than the Magic Missile, but weaker than the Rainbow Rod. It is located in Shadow Chests in the Underworld. Once it hits something it disappears.
While controlling the projectile you will slowly regenerate mana, it will also disappear in 1 minute after cast, so you need to be time-efficient.
The Flamelash emits light and sparks that fall far down before decaying. This makes it useful for exploring large caves or looking for ore deposits directly beneath the fireball.
The fireball will vanish upon hitting an enemy once, hitting a solid block, hitting water, or after a set period of time.