How to use an Eternia Crystal in Terraria
To use an Eternia Crystal in Terraria, you first gotta have an Eternia Crystal Stand to place it in. Make sure you're geared up because placing the crystal starts the Old One's Army event, which is a wave-based invasion. You can buy the stand and the crystals from the Tavernkeep NPC. Just slap the crystal into the stand, and you're all set for some action-packed defense gameplay!
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Protip: Before using an Eternia Crystal, prep your arena with traps and defenses. Those Etherian baddies don't mess around, and you'll thank yourself for setting up a solid defense line. Saw someone do this without prepping once... didn't end well.
Just buy a stand from the Tavernkeep dude, stick the crystal in it, and boom, invasion time. Get ready to fight!
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