Deep Dark Portal

You should add a new dimension through the deep dark portal, that you have to activate a certain way, maybe nether stars? Behind the portal in the new dimension maybe make a giant dimension with tons of new bosses and mobs. Maybe a new final boss? Maybe infected mobs, skulk zombies, skeletons, villagers, just a complete skulk dimension. The biggest, most dangerous, dimension yet. Maybe the final boss could be a giant skulk monster, like a Warden 2.0?