Origins in Aman: The Creation of the Seeing-stones

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The Palantíri were created in Valinor during the Years of the Trees, when the world was still illuminated solely by the light of the Two Trees, Telperion and Laurelin. These remarkable artifacts emerged from the blessed realm during an age of profound enlightenment and unprecedented craftsmanship among the Elves.
The creation of the Seeing-stones stands as one of the greatest achievements of Fëanor, the most gifted craftsman ever born among the Elves. The same masterful hands that created the Silmarils also shaped these mysterious orbs, imbuing them with properties that even the wisest of Middle-earth never fully understood.
When the Faithful Númenóreans, led by Elendil and his sons, fled the downfall of their island kingdom, they brought seven Palantíri to Middle-earth as gifts from the Elves. These stones were originally presented to the Lords of Andúnië, who remained true friends of the Elves and kept faith with the Valar, marking them as trusted guardians of these powerful artifacts.

Physical Properties of the Seeing-stones

The Palantíri varied dramatically in size, ranging from small spheres that could be easily lifted to massive globes requiring great effort to move. The smallest were approximately one foot in diameter, while the largest, such as the Osgiliath stone, measured about three feet across.
Each Seeing-stone was crafted from an unknown crystal-like substance that appeared black when dormant but could fill with inner fire when in use. The material proved virtually indestructible, resisting all normal attempts at damage or destruction, suggesting its creation involved powers beyond mortal understanding.
The surface of each Palantír exhibited perfect smoothness, without any visible marks, seams, or imperfections. This flawless exterior contributed to their mysterious appearance and was integral to their function as devices of vision and communication.
A peculiar property of the Seeing-stones was their unusual weight distribution. As they increased in size, their weight grew at a rate far exceeding what their dimensions would suggest, making the larger stones extraordinarily heavy and difficult to transport without significant preparation and effort.

Powers and Capabilities

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The primary function of the Palantíri allowed users to witness events occurring at great distances, providing real-time visions of places far beyond normal sight. These images appeared with perfect clarity within the stone's depths, though they required careful concentration to direct and maintain.
When multiple Seeing-stones were in use simultaneously, their users could communicate directly with one another across vast distances. This communication manifested as both visual and mental contact, allowing the exchange of thoughts and images between skilled practitioners separated by hundreds of miles.
The stones possessed the remarkable ability to reveal historical events that had transpired in their immediate vicinity, though this power was limited and required great skill to access. These glimpses into the past could provide valuable insights but were often fragmentary and difficult to interpret correctly.
Successfully operating a Palantír demanded exceptional mental fortitude and extensive training. Users needed to possess both the right to use the stones and the wisdom to direct them properly, as untrained or weak-minded individuals risked severe consequences from improper use.

The Seven Stones of Gondor

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The Osgiliath Palantír, considered the greatest and most powerful of the seven stones brought to Middle-earth, was lost during the Kin-strife when it fell into the Anduin River. This Master-stone had unique properties that allowed it to oversee and coordinate the use of other stones in the network.
The stones of Minas Ithil, Minas Anor, and Orthanc formed a crucial network across Gondor. The Ithil stone fell into Sauron's possession when Minas Ithil became Minas Morgul, while the Anor stone remained in the care of the Stewards until Denethor's tragic end. The Orthanc stone, used by Saruman and later Aragorn, survived the War of the Ring.
In the northern kingdom of Arnor, Palantíri were stationed at Annúminas, Amon Sûl, and Elostirion. The Elostirion stone was unique as it could only look westward across the sea to Tol Eressëa, while the others were lost during the kingdom's dissolution and subsequent conflicts.

Proper Use and Mastery

The use of Palantíri was traditionally restricted to those of royal Númenórean descent, as they possessed the inherent strength and authority to master the stones. This bloodline requirement ensured that only those with the proper heritage and training could access their power safely.
Before attempting to use a Palantír, potential users underwent rigorous preparation and training to develop the mental discipline necessary for controlling these powerful artifacts. This training often took years and required guidance from experienced users who understood the stones' intricacies.
Those who attempted to use the Seeing-stones without proper preparation or inherent strength risked severe physical and mental exhaustion. In extreme cases, the stones could literally drain the life force from users who lacked the necessary fortitude to control them.
Each Palantír possessed its own unique characteristics and challenges, with some stones proving more difficult to master than others. The size of the stone often corresponded to its power and the difficulty of its use, with larger stones requiring greater strength of will to control effectively.

Limitations and Dangers

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Despite their great power, the Palantíri had significant limitations in their ability to see through physical obstacles. The stones could not penetrate solid objects or pierce through areas of complete darkness, requiring a clear line of sight to function properly.
The network of Seeing-stones operated on the principle of direct lines between them, meaning users could only establish clear communication when an unobstructed path existed between two stones. This limitation affected both their communication and viewing capabilities.
Perhaps the most dangerous aspect of using the Palantíri was the risk of mental domination by stronger users. This vulnerability became particularly apparent during the Third Age when Sauron, controlling the Ithil stone, could influence and deceive other users of the network.
Users of the stones faced the constant danger of receiving false or misleading images, either through deliberate manipulation by other users or through misinterpretation of the visions themselves. The stones showed many things, but distinguishing truth from deception required great wisdom and discernment.
Extended use of a Palantír extracted a heavy toll on both body and mind. Users often emerged from their sessions physically drained and mentally exhausted, with prolonged use potentially leading to lasting damage to both physical and mental health.

Legacy and Current Status

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By the end of the Third Age, most of the Palantíri brought to Middle-earth had been lost, destroyed, or corrupted beyond safe use. The destruction and loss of these powerful artifacts represented a significant decline in the capabilities and connection between the realms of Men.
Following the War of the Ring, the Orthanc stone was taken into the West aboard the white ship that carried Elrond and the other Ring-bearers to Valinor. This final journey of one of the last functioning Seeing-stones symbolically marked the end of their era in Middle-earth.
The few Palantíri that might have survived into the Fourth Age were kept hidden and unused, their locations known only to a select few. This secrecy stemmed from the hard-learned lessons about their potential for misuse and the dangers they posed even to worthy users.