Eternia Crystal
From Terraria Wiki
| Eternia Crystal
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| Statistics | |||
| Type | Summoning | ||
| Tooltip | Place in the Eternia Crystal Stand to summon Etheria's portals | ||
| Rarity | 
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| Buy / Sell | T1: 25  / 5 T2: 1  / 20 T3: 4 / 5
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| Internal Item ID: 3828 | |||
 Desktop-Only Content: This information (or parts of it) applies only to the desktop version of Terraria.
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- Not to be confused with Eternia Crystal (NPC).
Eternia Crystals are purchased from the Tavernkeep for 25 (pre-Mechanical Bosses), 1 (post-Mechanical Bosses) or 4 (post-Golem). The Discount Card and Greedy Ring have no effect on its price. Because of the price increase, you may wish to stock up before defeating the mechanical bosses. When used in the Eternia Crystal Stand, the Old One's Army event begins.
The Event lasts for varying lengths depending on game progress:
- Tier 1: 5 waves
- Tier 2 (After defeating any Mechanical Boss): 7 waves
- Tier 3 (Post Golem): 7 waves + Boss wave (Betsy)
The waves begin easy and get progressively more difficult until the final wave (wave 7 post and pre-golem) there is a boss as well as the invasion creatures. Defeating the boss finishes the wave, however.
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