Discovering Biomes and Structures in the Starlight Dimension
The Starlight Dimension is a mystical realm that features diverse biomes and unique structures to explore. To access this dimension, first locate the Starlight Portal Ruins in the Overworld and defeat The Gatekeeper.
Temperate Biomes
Several biomes within the Starlight Dimension share a temperate climate, with a temperature of 0.5.
Lucent Mycelium Isle
This temperate biome is home to various creatures. You may encounter ent, ratlin, and shadow snail here.
Lush Shallow Sea
The Lush Shallow Sea is a temperate biome where you can find both monsters and water creatures. Nightfall spider, lonestar skeleton, and seeker are among the monsters that spawn here. The water creature 
rookfish can also be found in this biome.
Scarlet Forest
The Scarlet Forest is a temperate biome where you might encounter nightfall spider, lonestar skeleton, and seeker as monsters. Creatures such as ent, ratlin, and shadow snail also spawn in this area.
Shimmer River
As a temperate biome, the Shimmer River has a temperature of 0.5. Monsters like nightfall spider, lonestar skeleton, and seeker spawn in this area. Additionally, the water creature rookfish can be found here.
Snowy Biomes
Permafrost Peaks
The Permafrost Peaks biome has a snowy climate, with a temperature of -0.3. This area is inhabited by a variety of monsters and creatures. Monsters include nightfall spider, lonestar skeleton, and seeker. You may also encounter creatures such as ent, ratlin, shadow snail, yeti, and aurora deer.
Hot Biomes
Solaris Isles
The Solaris Isles biome is characterized by its hot climate, with a temperature of 2.0. This biome experiences no rain. Creatures that spawn here include ent, ratlin, and shadow snail.
Locating Bosses
To find boss encounters within the Starlight Dimension, use the 
Seeking Eye. Once you have located a boss, refer to the clues provided on the 
Glimmering Tablet to track them down.
What to bring back
Exploring pays in materials that exist nowhere else, and they feed one chain.
Deepsilver is the workhorse: its ore turns up in grimstone, voidstone, nightfall mud and both ices, and the 
Alloy Furnace doubles it — one ore plus 
Saltpeter Powder gives two 
Deepsilver Ingot, or two raw give three. Deepsilver armour is worth wearing on the way, since it grants immunity to a set of negative effects.
Three Deepsilver Ingot and two 
Golem Steel Nugget alloy into a 
Golem Steel Ingot, and one of those plus a deepsilver ingot, a 
Malarite and a 
Soul Dew produces a single 
Unrealium Ingot — the top of the mod. Unrealium armour trades raw numbers for immunities: the helmet blocks suffocation damage, the chestplate blocks entity cramming, and each piece quietly mutes a category of sound.
The one shortcut worth knowing
The Alloy Furnace also alloys vanilla netherite from four 
Gold Ingot and just two Netherite Scrap, against the four scrap the vanilla recipe demands. Every piece of ancient debris you have ever mined is worth twice as much once that furnace is standing, which is a strong argument for clearing the Golem Forge earlier than its difficulty suggests.
Navigation
Structures are found with the Seeking Eye, and it only points at a specific structure when you are also holding the matching locator item — the Glimmering Tablet lists which item goes with which. Without a locator the eye still works, but it will lead you to whatever is nearest rather than to what you are looking for.
Covers the mod’s in-game guide topics: Lucent Mycelium Isle Lush Shallow Sea Permafrost Peaks Scarlet Forest Shimmer River Solaris Isles
Nightfall Mud
Grimstone
Voidstone