Respawn Bosses is an obtainable option to respawn all bosses in the server of the player that bought it, with the exception of raid boss. This product is mainly used to grind mastery on fruits, swords, guns and fighting styles.
If you bought this in the first sea, you would also spawn the Saw Boss which is useful if you are trying to get the Shark Saw
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The player can buy them for 50 each in the shop.