Tenchi can form the Light-Hawk Wings and has the master key. Tenchi cannot form Light-Hawk Wings, but has a wooden sword. All replaced by a nifty sword from his mom. Strange gems give great power. No gems, no crystals.
Strange crystals give great power.
Ryoko is trapped in the Masaki cave. Washu is trapped in the Masaki cave. Yugi seals herself in the Masaki cave. Ryoko was a space pirate controlled by Kagato. Ryoko is a space pirate of her own accord.