maybe it is ordinary vine grass mutated by dead dragon's energy and nutrients?
The skeletal dragon’s withered vine was a rare spiritual herb growing on the skeleton of dead dragons, and that ‘dead dragon’ didn’t refer to dinosaurs, but real dragons.
Urban · Legend of the Paladin
he was authorized by profound principle, so sword was lighter for him.
"This flying sword is made of a very hard material. Therefore, it’s normal for it to be heavy." Senior Brother Three Realms said with a smile. Then, he put various layers of protection on the USB flash drive. If someone tried to forcefully remove them, the USB flash drive would self-destruct.
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Urban · Legend of the Paladin