“Legend says that
my grandfather imbued it with unimaginable power so that our clan would always have the strength of the dragon to protect them. Its true power will only show itself to those deemed worthy, a true member of our clan who's proven themselves strong enough to protect our family from the forces of evil.”
Jade is the heirloom of the Dragon Blade  Dragon Family, which is a legendary sword that Mei uses to fight aganist Demons.
After Mei jumped out of her bike to retrive the Skeleton Key from Red Son, Mei used the Dragon Blade to destroy the
After entering the Flaming Foundry, Mei used the Dragon Blade to save her and MK from falling.
Sword Beam Emission - The Dragon Blade is able to fire blasts of energy from it.
Names in other languages
Chinese: Yùlóng bǎojiàn (玉龙宝剑, “Jade Dragon Sword”)
While the hilt of the sword is a recolored version of the Dragonbone Blade's from , the blade of the sword was introduced in Ninjago Nexo Knights.
Coincidentally, both Ninjago and Nexo Knights had a TV show made by Cartoon Network with the episode " The Golden Castle" in having a few nods to the former. Nexo Knights
LEGO® Building Instructions