Literature
Sonic TNG Chapter 4
Back at Tails' house, Rouge was tucking in Cosmo with a cloth on her forehead, as Cosmo is still asleep.
--
"I can explain," said Sharp with the others in the living room as they listened, "Your friend, Cosmo, was attacking these creatures known as the Black-Hearts. They're powerful creatures, who are willing to take lives of clans and the life of another planet." An image of a Black-Heart comes up with a black diamond which digs into the ground. "Also, the black diamond you have seen
they're known to be Nightmare Crystals."
"Nightmare what?" Sonic asked.
"The Nightmare Crystal, a very dangerous and threatening weapon of the Black-H