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:

Unlockable Crystal Skins
Image Name Achievement Image Name Achievement
Crystal Classic
Classic None
Crystal King's Crown
King's Crown O Mighty Smiter!
Crystal Crystalline
Crystalline Good Student
Crystal Geode
Geode And This Is My Weapon
Crystal Mystical
Mystical Pupil
Crystal Cell
Cell Veteran
Crystal Molecular
Molecular Brute Force
Crystal Runic
Runic From the Depths
Crystal Landscaped
Landscaped To The Rooftops
Crystal Waterfall
Waterfall Defender of Etheria
Crystal Eastern
Eastern A Taste of Victory
Crystal Western
Western A Challenger Approaches
Crystal Fantasy
Fantasy A Matter of Perspective
Crystal Urn
Urn Perfectionist
Crystal Organic Goblet
Organic Goblet Group Hug
Crystal Book of Souls
Book of Souls Obedience Training
Crystal Goblet
Goblet Survivalist
Crystal Skulltacular
Skulltacular Daredevil
Crystal Money
Money Master Banker
Crystal Horned
Horned Iron Man
Crystal Sky City
Sky City Mastermind
Crystal Bio Container
Bio Container Catch 'em All
Crystal Fusion Core
Fusion Core Dungeon Defender
Crystal Obelisk
Obelisk Team Effort
Crystal Pandora's Box
Pandora's Box Defense is the Best Offense
Crystal Lovely
Lovely Playin' Mythical Cupid
Crystal Birthday
Birthday Nightmare Anniversary Defender
Crystal Trick or Treat!
Trick or Treat! Pumpkin Party Nightmare
Crystal Gobble Gobble
Gobble Gobble Nightmare Greater Turkey Hunter
Crystal You Are Trendy
You Are Trendy Legendary Defender
Crystal Ultimate
Ultimate Ultimate Defender
Crystal Nguzo Saba
Nguzo Saba ??
Crystal Ho Ho Ho
Ho Ho Ho Silent Night
Community content is available under CC-BY-SA unless otherwise noted.