The Death Busters eventually discover that Haruka and Michiru hold two of the Talismans and acquire them at the cost of their lives, but Setsuna — who holds the third — revives them. The Talismans create the Holy Grail, allowing Usagi to acquire a second form: Super Sailor Moon. The Death Busters' intentions then change to harvesting Heart Crystals en masse to resurrect the malevolent entity known as Mistress 9. Chibiusa also befriends a sickly girl named Hotaru, unaware that she is the daughter of the Death Busters' leader, Professor Tomoe. Unknown to her, Hotaru is also Sailor Saturn, a Sailor Soldier capable of destroying and rebirthing entire planets. Haruka, Michiru and Setsuna fear that her awakening will result in Earth's destruction and plead for Usagi to kill her.