This mod makes activating the End Portal far more challenging. To open it, you must hunt down the Twelve Elemental Eyes -- each obtained in a unique way -- and slot them into the new portal frame.

How to Obtain Each Eye:

Eye of Aether: Crafted using Ender Pearl, Enchanted Golden Apple, and Slimeball
Eye of Dunes: Dropped rarely by Husks.
Eye of Chaos: Dropped rarely by Witches.
Eye of Nature: Found in Jungle Temples.
Eye of Flames: Found uncommonly in Nether Fortress chests.
Eye of Frost: Dropped rarely by Strays.
Eye of Storms: Dropped by Charged Creepers.
Eye of Magic: Dropped by Evokers.
Eye of Nether: Crafted using Ender Pearl, Nether Wart, and Ghast Tear
Eye of Order: Bought from expert Cleric Villagers.
Eye of Void: Found in Mineshaft chests.
Eye of Tides: Dropped by Elder Guardians.

Feature List:

Replaces the vanilla world-generation of the End portal frame with the custom version
Twelve Eyes to collect before you can reach The End, each with their own method of retrieval
Each Eye has a tooltip that describes how to obtain them.
Compatible with End Expansion - The Lamented Islands / Unseens Better Stronghold
Config to remove all trades, chest loot, and monster drops for the Elemental Eyes (but not recipes)

Future Plans:

Config to define other items that can be slotted into the portal frames
Advancements?

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Is this mod compatible with X other mod? What should I do if I run into an issue?
I've tested this mod in a pack of ~300 mods and haven't had any crashes.
If you encounter unexpected behaviors or incompatibilities, please report it to the Github Issues page.

Will you update or backport this mod to my favorite version?
No, but if you would like, you can do it yourself.

Where can I ask for a feature or suggest something?
The Curseforge comment section would be preferred.

Can I include this in my modpack?
Yes! Curseforge mods in a Curseforge pack are always allowed. You can add this to your non-Curseforge modpack, too.

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Credits:
jack_bagel for creating End Remastered, which inspired this project.

https://ko-fi.com/fullskele