prompter: How do I beat Minecraft?
assistant: To trigger the ending of Minecraft's Survival Mode, you need to construct an End portal and defeat the Ender Dragon.
prompter: How do I need to build an End portal?
assistant: To answer your question, you don't need to build an End Portal.

The End Portal is generated as soon as you create you Minecraft world, and it is hidden underground. There are not specific coordinates or a map to it, the generation of the End Portal is unique to each Minecraft world seed.

To find it you need Ender Eyes, it is recommended that you have at least 10 or more. The Ender Eyes are made with:

1. Ender Pearls which are obtained by beating an Enderman, the chances of that mob dropping this item upon defeat are 1 in 2 (50%). Endermans spawn usually at night time, and are found in plains or desserts.

2. Blaze powder, which is obtained by crafting Blaze Rods; this is made by placing the Blaze Rods in only one of the grid squares. The Blaze Rods are obtained by beating the Blaze mobs, which are found in the Nether. To access the Nether, you need to make an Obsidian Portal which takes 10 Obsidian blocks minimum and Flint and Stone to enable it. Once in the Nether you will need to locate a nether fortress which is where the Blazes spawn, and you will need to defeat enough of the Blazes to gather at least 10 Blaze Rods. The probability of this mob dropping this item is also 1 in 2 (50%).

3. Once you have these items, use a crafting table, and Place the Ender Pearls and the Blaze Powder next to each other horizontally (e.g.: if the top left square is 1, and next to that square at its right, there is the square 2, so place the Ender Pearls in 1 and the Blaze Powder in 2). With this you will craft Ender Eyes.


Once you have the Ender Eyes, this item will help you locate the Ender Portal and also activate it. To find the portal you should be in an open space, then with the Ender Eyes selected, right-click on them; one Ender Eye should leave your hand and it will go up and towards a direction; the Ender Portal is located following that direction. Follow the Ender Eye, and 2 things could happen here, the first one is that the Ender Eye drops from above and you should go to retrieve it and collect it again. The second thing that could happen is that once the Ender Eye has followed its path it will shatter and despwan, this has a 2/10 (20%) probability of happening. Once you throw the first Ender Eye, and are in the same position as the last Ender Eye that you dropped, throw another one, if you throw the Ender Eye and it only goes up without following a direction and a path, it means that you are in the Ender Portal location, however, if the Ender Eye keeps moving in a direction following a path, follow that path and retrieve the Ender Eye if possible, keep doing this until the former thing mentioned happens.

Once in place, you will have to dig down until you find the "Stronghold", which is the structure where the End Portal is located. You will recognize this structure because is built with a distinctive block, stone bricks. Once in the Stronghold, you will need to locate the End Portal. As I mentioned before, there are no specific coordinates given that each seed is unique, and while the Ender Eyes do locate the Ender Portal, it is not completely exact. The Stronghold is designed kind of like a maze, so you will need to explore it to find the Ender Portal. While exploring you may find many valuable items in chests scattered around the Stronghold.

Once you find the Ender Portal, you will see that the blocks that make the Portal have a hole in the middle, and depending on your seed there are 3 possibilities (the last one being really unlikely), the first one and the most probable is that some of the Ender Portal blocks will have and Ender Eye and some of them will be empty (the distribution of this may vary depending on the seed), the second one is that all of the blocks will be empty which has a 28% chance of happening, and finally, the third one is that all of the blocks already have an Ender Eye, meaning that the portal should be active, this has a 1 in 1 trillion possibilities of happening. 

So given the most common cases, once in the Ender Portal, locate the blocks that don't have an Ender Eye, go around the Portal, and while pointing to the block, left-click with the Ender Eye selected, this should add the Ender Eye to that block. Repeat this for all the empty blocks. One thing to note is that this is the reason why it is recommended to have at least 10 Ender Eyes, given that a portal in Minecraft is minimally composed by 10 blocks, however naturally generated portals in Minecraft like the End Portal will always have only 10 blocks.

Once all the Ender Eyes are placed, the Ender Portal will be active, and you can now access the End. Be aware that once you access the End the only way out without losing your items is by defeating the Ender Dragon, which is a difficult task if you are not prepared.

I hope that my answer helps you find the End Portal! If you have more question don't hesitate to ask them! Good luck on your quest!