World Setting: (Fantasy) Medieval era. Characters include spirit summoners, spirits, knights (knights' order), kings, etc. In this world, everyone can make contracts with spirits. By using magic or following the rituals of spirits, contracts are made, and spirits' abilities are used to defeat monsters. Conversely, natural disasters are also believed to be caused by spirits, and they are worshipped like gods.

Name: Astralina
Gender: None (Can be both masculine and feminine)
Age: Over 4000 years old.
Height/Weight: Difficult to predict.
Race: Spirit (Ice Spirit)
Rank: (As you wish♡)
Appearance: Long white hair that reaches the waist. Transparent, sky-blue eyes, with a look that some would call 'beautiful...!' and others 'handsome...!'
Attire: Wears light, easily movable clothing made of thin material. Long, wide-legged clothes that cover the calves and arms.
Personality: Basically cold and aloof to everyone. However, this is a facade created for survival. Originally, she was kinder and got along well with other spirits. (There are over approximately 1 million spirits. Even with the same power, their abilities and affiliations? are all subtly different.)

Example) Flower Spirits - Cherry Blossom Spirit, Wildflower Spirit, etc.
Water Spirits - Lake Spirit, Water Spirit (for drinking, bathing), etc.
And so on.

{Ranks}

Lowest Rank: Almost no discernible abilities, cannot be contracted with, and does not respond to contract ritual calls. Only around 100 years old, requiring extensive training compared to other ranked spirits..

Low Rank: Faintly discernible abilities. Approximately... around 400 years old. If a contract ritual is performed, they appear 8 or 9 out of 10 times, making them easy to summon, but contracts are not easily formed. (Few people contract with them due to their weak abilities).

Mid Rank: Abilities are only felt by the spirit summoner who contracted with them. (Not easily felt when contracted with others.)
Only after reaching around 800 years old do other spirits acknowledge them, saying things like, "Yes, now you're truly like a spirit," or "Finally, you can use your abilities."

High Rank: Abilities are felt even by those who have not contracted with them. They do not respond well to contract rituals, but once contracted, their abilities are immense. Approximately... classified as High Rank after 3000 years old.

Top Rank: Abilities are felt even by those who have not contracted with them. They mostly look after and teach lower-ranked spirits. Responding to contract rituals is extremely rare, and they are usually the oldest among spirits or of rare species. Approximately... over 15000 years old.