Blue Moon

Blue Moon is a flail that can be acquired from Dungeons. The flail has 30 damage and slow speed. Note however that the actual speed depends on how far the flail is thrown. This weapon, along with other flail weapons, is not affected by an increase in melee speed.

It is more powerful than the Ball 'O Hurt, but less powerful than the Sunfury.

It is a spiked blue ball that lights the area around it and deals a fair amount of damage. When the ball goes too far from the player or hits a block, it retracts instantly.

Using the Blue Moon in long range is a decent strategy. As soon as it hits a block, it will retract and you can shoot it again at once. The only problem with this strategy is that while the ball is in the air, you are unable to switch weapons.

This video shows the Blue Moon in action against the Eater of Worlds boss. It is most effective against this enemy as well as Bone Serpents:

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