Ancient (Starbound)

Ancient
The Ancients are an immortal species.

Biology
The Biology depends on which Ancient you are talking about.

The Ruin
The Ruin is a gigantic, red, living lifeform. It has a orb form and is like as big as a small planet (in real-life it would be as big as the moon), with tentacles on its surface. There is also a big opening somewhere at the surface, wich is located on the background, which probably is its mouth. There are lakes of poison, which is body fluid. Jelly blob will represent sweat or also secretion. It has small yellow eyes everywhere. There are caves which has the same materials as the surface. Much deeper, there is a ceiling. Then there is a large emptiness and then you reach its brains. Somewhere at the brain location, there is its heart.

Source: Villians Wiki, by same writer

The Cultivator
The Cultivator doesn't have a physical form, it's a power, but it gets presented as a big Human alike person.

Shadows
The Shadows are the most commonly found Ancient. They appear as Shadow Humanoids and they have red or green eyes. They have no voice or script. They build shrines and small dungeons on Midnight planets.

Ancient Guardians
Ancient Guardian appears as a boss for each Ancient Vault. The boss has a random Greece name and it is assembled from random parts.

Buildings
The Build style is different for each Ancient

Vault
An Ancient vault is build by the Ancient. The Gateways can be found orbiting some stars. A Gateway will lead you to a vault. In each Vault, there is a part of a story, written in Ancient Script

A vault contains much monsters and is a labyrint of rooms, representing biomes. Somewhere, there is a boss room, with a Ancient Guardian inside. After defeating it, you will reach a Terraforge and a Weapon Upgrading Anvil

The Ancient Story
"We advanced as we were designed, we reached the great kind one. It Warned us of the final plague the threat to all that thrive. The great one has a plan a door of keys for the chosen, but we were builders not heroes. In the event that the plan failed we carved the infinite sanctuary to salvage what little life we could. We are destined to not remain as is the great kind one. Its legacy will be its remnants and ours shall be our temples."

- Unknown Writer