How many wrecks of the Galaxy battleship unlock the Death Star?

In the Destiny/Crown mission, the Death Star of the Galaxy Battleship needs 1000 pieces of Galaxy to unlock it.

In the game, players can get Galaxy fragments by completing the main task, activity task and shopping mall purchase. When players collect enough pieces of Galaxy, they can be used in in-game stores to exchange and unlock the corresponding props or equipment. Including 1000 Galaxy can be exchanged for the option of unlocking 1 "Soul Mecha Death".