### Chapter Name:
**Celestial Swords**

### Founding:
The Celestial Swords are a 21st Founding (also known as the "Cursed Founding") Space Marine Chapter.

### Gene-Seed:
The Celestial Swords derive their gene-seed from the noble Ultramarines.

### Chapter Master:
**Chapter Master Alaric Thorne** - A stoic and disciplined leader who embodies the virtues of honor and duty.

### Homeworld:
**Arcturus Prime** - An ice-covered planet with towering crystalline spires and ancient, forgotten ruins. The planet's harsh conditions have forged the warriors of the Celestial Swords into indomitable and resilient soldiers.

### Fortress Monastery:
**The Citadel of Echoes** - Built within the heart of a colossal glacial structure, the Citadel of Echoes is both a fortress and a vast repository of ancient knowledge. Its walls resonate with the history and legacy of the Chapter.

### Chapter Colors:
**Royal Blue and Silver** - Symbolizing their connection to the Ultramarines and their unyielding spirit, the Celestial Swords don royal blue power armor with intricate silver trim. Their insignia, a sword with wings, is worn proudly on their shoulder pads.

### Chapter Traits:
1. **Glacial Resolve**: Unyielding and steadfast, Celestial Swords are known for their incredible mental and physical resilience.
2. **War Scholars**: The Chapter places a significant emphasis on strategy and tactics, often studying ancient texts and battle doctrines to outthink their foes.

### Combat Doctrine:
The Celestial Swords excel in defensive warfare and hold the line in seemingly hopeless situations. Their tactics revolve around using their environment to their advantage, setting traps, and executing ambushes. They also have a significant focus on ranged combat, utilizing their bolters and heavy weaponry to lay down withering fire before closing in for the kill.

### Notable Units:
1. **Winter Guard**: The elite first company of the Celestial Swords, these veterans are equipped with terminator armor and specialize in both assault and defense in frozen environments.
2. **The Glacial Hunters**: Scouts and Reivers trained to move silently through icy terrains, providing the Chapter with vital reconnaissance and surgical strike capabilities.

### Chapter Beliefs:
The Celestial Swords have a quasi-religious reverence for the stars and the void, seeing themselves as guardians of the vast unknown. They perform ancient rites and star-gazing ceremonies to honor their forebears and seek guidance from the Emperor and the Primarch Roboute Guilliman.

### Signature Relic:
**The Starlight Blade** - A master-crafted power sword said to be forged from a meteorite that fell on Arcturus Prime. It glows with an ethereal light, symbolizing the wisdom and might of the Chapter.

### Battle Cry:
"For the Stars! For the Emperor!"

### Current Activities:
The Celestial Swords are currently engaged in defending the Eastern Fringe against Tyranid incursions. They are also investigating mysterious disturbances and seeking lost relics on distant worlds, ever vigilant against threats to humanity and the Imperium.

### Notable Campaign:
**The Defense of Frostspire**: When a massive Ork Waaagh! assaulted Arcturus Prime, the Celestial Swords made their stand at Frostspire, an ancient fortress of crystal and ice. Their valiant defense, marked by tactical genius and unwavering bravery, broke the Ork assault and solidified their reputation as unyielding protectors of humanity.