End biome

So lets it be like a few end islands get a rare biome called The Mourning, this biome is filled with in gettable void related blocks and a pale purple tree and if we replace these void blocks with something called an Soul Stone(4 soul sand, 4 golden dandelions, and a netherstar) it will very rarely summon ghosts who drop Reverium, which can power an waystone called The Ancient Anchor(2 gold, 2 diamond, 1 respawn anchor and 4 endstone) that ends thus Reverium to work(make it only work in the end!) And maybe create a unknown end beast that has a chance of attacking you with its tentacles when your flying over the void to create a challange or more tension