Besides your quest to find Zelda, there are plenty of side activities to do in The Legend of Zelda: Skyward Sword HD, including helping the residents of Skyloft and earning Gratitude Crystals ...

Crystal sword in Elden Ring can be upgraded to +10 with the help of Somber Smithing Stones. At its highest level, it deals 259 Physical and 196 Magic damage.

The crystal company made new collectibles inspired by Master Chief's Mjolnir helmet and the Energy Sword. They aren't going on sale publicly, but fans can enter a contest to win one.

Gratitude Crystal locations — Zelda: Skyward Sword HD guide. Where to find all Gratitude Crystals for Batreaux. by Jeff Ramos. Updated Jul 23, 2021, 9:38 PM UTC. Image: Nintendo via Polygon.

The weapon inside is the Crystal Sword for Cloud, which prioritizes Magic over Attack (but not as much as the Rune Blade does), which can be evened out with the “Attack Power +20” Weapon Skill.