The Eternia Crystal has many different skins that players can choose. The skin can be changed in the main menu screen where the player selects a character. Each skin is purely cosmetic, and therefore does not affect the crystal's health.
The different skins are obtained by completing achievements in game and are as follows:
| Unlock-able Crystal Skins | |||||
|---|---|---|---|---|---|
| Image | Name | Achievement | Image | Name | Achievement |
| Classic | None | King's Crown | O Mighty Smiter! | ||
| Crystalline | Good Student | Geode | And This Is My Weapon | ||
| Mystical | Pupil | Cell | Veteran | ||
| Molecular | Brute Force | Runic | From the Depths | ||
| Landscaped | To The Rooftops | Waterfall | Defender of Etheria | ||
| Eastern | A Taste of Victory | Western | A Challenger Approaches | ||
| Fantasy | A Matter of Perspective | Urn | Perfectionist | ||
| Organic Goblet | Group Hug | Book of Souls | Obedience Training | ||
| Goblet | Survivalist | Skulltacular | Daredevil | ||
| Money | Master Banker | Horned | Iron Man | ||
| Sky City | Mastermind | Bio Container | Catch 'em All | ||
| Fusion Core | Dungeon Defender | Obelisk | Team Effort | ||
| Birthday | Nightmare Anniversary Defender | Trick or Treat! | Pumpkin Party Nightmare | ||
| Pandora's Box | Defense is the Best Offense | You Are Trendy | Legendary Defender | ||
| Lovely | Playin' Mythical Cupid | Ultimate | Ultimate Defender | ||