The Stronghold
Illagers built these large fortresses around the End Portals, fending off anybody who wants to access The End.
Dragon's Den
The main island has been completely overhauled, being a lot less bland, but still only serving as an arena to fight the Ender Dragon.
The Ender Dragon
Ender Dragon is now tankier, having 300 HP compared to vanilla's 200. It no longer spawns by default, forcing players to spawn it manually, which helps build the tension before the fight (but 4 Crystals can be found in a Chest near the Exit Portal ;) )
Altar of The Accursed
Containing only the darkest powers of the end, The Altar can be used to perform a plethora of different rituals, which range from simple crafting to unbinding enchantments and transferring them to unenchanted books.
Ender Wastes
Biomes in Stellarity vary greatly. Some of them are lively and colorful, while some keep the barren and desolate feel of vanilla End.
Amethyst Forest
Most biomes in Stellarity follow the theme of magic, being vivid in terms of colors and having a wide block palette. All using ONLY blocks present in the base game!
Prismarine Forest
All biomes have a unique design. There is even one made out of flesh, which according to the lore of the mod (spoiler alert!) thinks and acts like one.
Ashfall Deltas
The biome distribution is about 50/50 - half of the biomes are desolate and devoid of life, while the other half is lively.
The Hallow
Not every biome is dark and purple. Some of them are filled with magic seemingly taken straight from a fairy tale.
The Hallow
Water in The Hallow can transmute items into something completely different. *Most* transmutations can work both ways, allowing more materials to become renewable or obtainable easier.