Like the Nether Reactor from older versions of Minecraft Pocket Edition, but this one adds new content for the End dimension instead...

-- New tree variant: sapling can be planted on End Stone and grown with bonemeal
-- New mushroom variant: can be planted on End Stone and grown into a giant mushroom with bonemeal
-- New groundcover: spawned by the End Reactor and obtainable by trading with Ender Piglins; can be spread to nearby End Stone using bonemeal
-- New hostile mobs: are spawned by the End Reactor when it is activated
-- New fluid type: can be placed/picked up using buckets obtained by trading with Ender Piglins
-- An extra set of tools, which provide a substantial mining speed boost... if you're brave enough to use them!

The End Reactor core can be crafted from iron ingots and end rods. Once the reactor structure is built, following the same pattern as the original Nether Reactor but with end stone instead of cobblestone, it can be activated by tapping the core. When active, it will set the time to midnight and begin spawning the new items and entities inside a large castle-like structure. When the reaction is complete, doors will appear in the castle walls and the daylight cycle will resume. If the core is mined before the reaction finishes, the glowing obsidian will remain and the time will be stuck at midnight -- until you build and activate another reactor.

Have fun! :D

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This pack requires the Beta APIs experimental toggle to be turned on. For best results, create the world with this setting BEFORE adding the behavior and resource packs. Otherwise, the inventory menu tabs may not load.

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Comment with your ideas for what other new stuff the End Reactor should give!