When using this mod and want to enter this dimension in any worldtype, be sure to build this portal like shown below! (in 1.12, use Stone Brick Slabs in place of the Polished Andesite Slabs) Then right click on the Polished Diorite with Flint and Steel to create the portal block. Right click again (without sneaking/crouching) on portal block to teleport to the Ultra Amplified Dimension! The reason why right clicking while crouching won't teleport you is so you can now place blocks on the portal itself if you want to. Also, you can mine the portal with any tool or your bare hands if you misplaced it (the portal will drop Polished Diorite when mined).
-
If you want to replace the Overworld with the Ultra Amplified terrain, change the worldtype to Ultra Amplified instead but keep in mind that this could break any mod that relies on the Overworld dimension being untouched. But when you are in this worldtype, the Ultra Amplified Dimension will now look like the Overworld and is accessible through the above portal. For server owners to use the Ultra Amplified worldtype, add ultra_amplified to the level-type entry in your server.properties file and then make a new world. The entry should look like this: level-type=ultra_amplified