The grim darkness of the far future in Warhammer 40,000 is a universe defined by constant war, where survival often hinges on the ability to forge alliances, however tenuous they may be. Among the most intriguing and unexpected of these alliances is the one that sometimes forms between the Eldar and the Space Marines. These two factions, so different in their origins, philosophies, and methods, find themselves occasionally standing shoulder to shoulder against threats that could consume them both. Let's dive deep into why this happens, exploring the lore, the key moments, and the implications of such a partnership.

Understanding the Eldar and Space Marines

Before we delve into their alliances, it's crucial to understand who the Eldar and Space Marines are individually. These are two of the most iconic factions in the Warhammer 40,000 universe, each with a rich history and distinct characteristics.

The Enigmatic Eldar

The Eldar, also known as the Aeldari, are an ancient and highly psychic race. Once the masters of the galaxy, their civilization fell into decadence and excess, leading to the birth of Slaanesh, the Chaos God of pleasure, pain, and excess. This cataclysmic event, known as the Fall, shattered their empire and scattered the survivors across the stars. Today, the Eldar are a dying race, desperately trying to preserve their culture and prevent their extinction.

The Eldar are divided into several sub-factions, each with its own unique path and philosophy:

• Craftworld Eldar: These Eldar live on massive, self-contained ships called Craftworlds, wandering the galaxy in search of safety and knowledge. They follow a strict discipline known as the Path, which guides them through various aspects of life and prevents them from falling prey to the temptations that led to the Fall.
• Harlequins: Mysterious and enigmatic, the Harlequins are followers of the Laughing God, Cegorach. They perform elaborate dances and plays that tell the stories of the Eldar, often mocking their enemies and celebrating their triumphs. They are deadly warriors, using their agility and skill to confound and defeat their foes.
• Drukhari (Dark Eldar): The Dark Eldar are the descendants of those Eldar who indulged in the most extreme excesses before the Fall. They dwell in the dark city of Commorragh, where they engage in torture, enslavement, and other depraved acts to sustain their immortal lives. They are sadistic and cruel, constantly seeking new ways to inflict pain and suffering.
• Ynnari: A relatively new faction, the Ynnari are followers of Ynnead, the God of the Dead. They seek to awaken Ynnead and use its power to restore the Eldar race. They draw strength from death, becoming more powerful as they fight and kill their enemies.

The Eldar are known for their grace, intelligence, and psychic abilities. They are masters of technology, creating weapons and vehicles that are both beautiful and deadly. They are also fiercely independent and distrustful of outsiders, making alliances rare and precious.

The Imperium's Angels of Death: Space Marines

The Space Marines, also known as the Adeptus Astartes, are genetically engineered super-soldiers created by the Emperor of Mankind. They are the elite warriors of the Imperium of Man, tasked with defending humanity from its many enemies. Space Marines are renowned for their strength, courage, and unwavering loyalty to the Emperor.

Space Marines are organized into Chapters, each with its own unique history, traditions, and gene-seed. Some of the most famous Chapters include:

• Ultramarines: The Ultramarines are considered the quintessential Space Marines, embodying the ideals of courage, discipline, and honor. They are renowned for their strategic acumen and tactical flexibility.
• Blood Angels: The Blood Angels are known for their artistic temperament and their struggle against the Red Thirst and the Black Rage, genetic flaws that drive them to bloodlust and madness.
• Dark Angels: The Dark Angels are shrouded in secrecy and haunted by the sins of their past. They are relentless hunters of the Fallen, those who betrayed the Chapter during the Horus Heresy.
• Space Wolves: The Space Wolves are fierce and independent warriors who embrace their barbarian heritage. They are known for their loyalty, courage, and their close bond with the wolves of their homeworld, Fenris.

Space Marines are heavily armored and armed with the best weapons the Imperium can provide. They are virtually fearless, charging into battle against overwhelming odds. They are the Emperor's Angels of Death, the last line of defense against the horrors of the galaxy.

Reasons for an Eldar and Space Marine Alliance

So, why would these two vastly different factions ever consider joining forces? The answer lies in the dire circumstances that often plague the Warhammer 40,000 universe. Both the Eldar and the Space Marines face existential threats that sometimes necessitate temporary alliances.

Shared Enemies

One of the primary reasons for an Eldar and Space Marine alliance is the presence of shared enemies. Both factions are constantly battling against the forces of Chaos, the Tyranids, and the Necrons. These threats are so immense and destructive that they can overwhelm even the most powerful armies. In such situations, the Eldar and Space Marines may find it necessary to put aside their differences and work together to survive.

• Chaos: The forces of Chaos are a constant threat to both the Eldar and the Space Marines. Chaos Gods seek to corrupt and destroy all that is good and orderly in the galaxy, and both factions have suffered greatly at their hands. The Eldar, in particular, are vulnerable to Chaos due to their psychic nature, while the Space Marines are constantly fighting against Chaos cults and daemonic incursions.
• Tyranids: The Tyranids are a ravenous alien race that consumes all biomass in their path. They are an unstoppable swarm, devouring entire planets and leaving nothing but barren rock in their wake. Both the Eldar and the Space Marines have faced the Tyranids on numerous occasions, and they know that only by working together can they hope to defeat this terrifying enemy.
• Necrons: The Necrons are an ancient race of undead warriors who have awakened from their long slumber. They are relentless and emotionless, seeking to reclaim the galaxy that was once theirs. The Necrons pose a threat to all life in the galaxy, and both the Eldar and the Space Marines must stand against them.

Mutual Benefit

Sometimes, an alliance between the Eldar and Space Marines can be formed out of mutual benefit. The Eldar possess knowledge and skills that the Space Marines lack, while the Space Marines have the strength and resources that the Eldar need. By working together, both factions can achieve goals that would be impossible to accomplish alone.

• Knowledge and Wisdom: The Eldar are an ancient race with a vast store of knowledge and wisdom. They understand the secrets of the Warp, the mysteries of the galaxy, and the dangers that lurk in the shadows. The Space Marines can benefit from this knowledge, gaining insights that can help them defeat their enemies and protect humanity.
• Military Strength: The Space Marines are among the most powerful warriors in the galaxy. They are heavily armed, well-trained, and fiercely loyal. The Eldar can benefit from their military strength, using the Space Marines to bolster their defenses and strike against their enemies.

Prophecy and Fate

In the Warhammer 40,000 universe, prophecy and fate play a significant role. The Eldar are particularly attuned to the currents of fate, and they sometimes see visions of the future that compel them to act in unexpected ways. If an Eldar seer foresees a great danger that can only be averted by an alliance with the Space Marines, they may choose to set aside their prejudices and work together.

• Farseers: Eldar Farseers are powerful psychics who can glimpse into the future. They use their abilities to guide their people, warning them of impending dangers and leading them to safety. However, their visions are often cryptic and difficult to interpret, and they must carefully consider the implications of their actions.
• The Webway: The Webway is a network of tunnels that spans the galaxy, allowing the Eldar to travel vast distances in a short amount of time. The Eldar use the Webway to move their armies, transport goods, and escape from their enemies. However, the Webway is also a dangerous place, filled with traps, monsters, and other perils.

Notable Examples of Eldar and Space Marine Alliances

Throughout the history of Warhammer 40,000, there have been several notable examples of Eldar and Space Marine alliances. These alliances, though rare, have often been crucial in averting disaster and saving countless lives.

The Battle of Craftworld Biel-Tan

One of the most famous examples of an Eldar and Space Marine alliance occurred during the Battle of Craftworld Biel-Tan. When the Craftworld was invaded by the forces of Chaos, the Eldar found themselves on the brink of destruction. In desperation, they sent out a call for help, which was answered by the Ultramarines Chapter of Space Marines.

The Ultramarines, led by the legendary Marneus Calgar, arrived just in time to reinforce the Eldar defenses. Together, the Eldar and Space Marines fought bravely against the Chaos invaders, repelling their attacks and driving them back into the Warp. The alliance was a testament to the courage and determination of both factions, and it saved Craftworld Biel-Tan from certain doom.

The Defense of Iyanden

Another notable example of an Eldar and Space Marine alliance occurred during the Defense of Iyanden. When the Craftworld was attacked by a massive Tyranid Hive Fleet, the Eldar were overwhelmed and on the verge of annihilation. In their darkest hour, they were aided by the Blood Angels Chapter of Space Marines.

The Blood Angels, led by Commander Dante, arrived to reinforce the Eldar. The battle that followed was fierce and bloody, with both sides suffering heavy losses. Despite the odds, the Eldar and Space Marines fought valiantly, holding back the Tyranid tide and preventing the destruction of Iyanden.

Combating the Forces of Chaos on multiple occasions

There have been numerous other instances where Eldar and Space Marines have put aside their differences to combat the Forces of Chaos. Whether it's fighting off a daemonic incursion or hunting down a Chaos cult, these two factions have occasionally found themselves on the same side of the battlefield.

Implications of the Alliance

The alliance between the Eldar and Space Marines, though rare, has significant implications for the Warhammer 40,000 universe. It demonstrates that even the most bitter enemies can find common ground when faced with a common threat. It also highlights the importance of cooperation and understanding in a galaxy torn apart by war.

A glimmer of Hope

In a universe defined by darkness and despair, the alliance between the Eldar and Space Marines offers a glimmer of hope. It shows that even in the grim darkness of the far future, there is still the possibility of redemption and reconciliation. By working together, the Eldar and Space Marines can create a better future for themselves and for the galaxy as a whole.

Shifting Factions

However, the alliance between the Eldar and Space Marines is not without its challenges. Both factions have a long history of conflict and distrust, and it can be difficult for them to overcome their prejudices. The alliance is often fragile and temporary, and it can easily break down if either side feels betrayed or exploited.

A look to the Future

Despite these challenges, the alliance between the Eldar and Space Marines remains a powerful symbol of hope in the Warhammer 40,000 universe. It is a reminder that even in the darkest of times, there is always the possibility of finding common ground and working together to create a better future. As the galaxy continues to face ever-greater threats, the alliance between the Eldar and Space Marines may become more common, offering a beacon of light in a sea of darkness. So, next time you're pondering the grim darkness, remember that even these ancient enemies can find a way to fight side-by-side!