Instead of waiting, people can respawn bosses by defeating NPCs on the same island as the boss, similar to Cake Prince's spawn method. Only players within 100 levels of the boss can contribute to the respawn (if the player is max level, then they can contribute to the respawn of the last boss. Currently, that would be Cake Queen). Only bosses that have a quest for levels can be respawned this way. To prevent exploitation of this system, there is a 5 second cooldown on counting the kill. Each island will have an NPC just like drip_mama which tracks the kills. The kills needed are universal, meaning anyone can contribute to one number if they are around the level of the boss.

Examples:

Defeat 25 NPCs at Jungle to respawn Monkey King.

Defeat 195 NPCs at Fountain City to respawn Cyborg.

Defeat 300 NPCs at Ice Castle to respawn Awakened Ice Admiral.

Defeat 1150 NPCs at Floating Turtle to respawn both Captain Elephant and Beautiful Pirate (yes, that is including all of Floating Turtle)

Defeat 750 NPCs at Ice Cream Land to respawn Cake Queen

Note: The option to respawn the boss by waiting is not gone, this is merely a secondary method to respawn.