#TLDR: Targonian Aspects represent ideological concepts like justice, war, change, protection, etc. Diana’s Aspect of the Moon represents the concept of Truth, and Leona’s Aspect of the Sun represents the concept of Faith/devotion.
The realm of the celestial Targonians is one of mystery and 4th dimensional tomfoolery, but one of things that we do know is that the major celestial beings are more than simply powerful beings and are actually representations of greater, more esoteric concepts. Concepts that exist whether or not there are sentient mortals that believe in them compared to spirits and spirits god-like entities such as Ornn or Janna.
> “The difference between celestial entities and spirits is the former exist even if no one knows/believes it…” - Lauri Goulding
The celestials are beings that embody abstract versions of ideals or core concepts of reality. Many of these concepts are already known to us: Pantheon represents the concept of war, the Aspect of Twilight represents the concept of change, and the Aspect of Justice obviously represents the concept of Justice. These Targonian celestial entities are the ones that are known to choose mortal vessels on Runeterra from people who are personally in tune with certain ideals and have proven themselves worthy.
> “The Aspect of War is the embodiment of a higher, celestial idea of War, placed into a mortal vessel that has proved itself worthy.” - Lauri Goulding
All Targonian mortal Aspects that we know of so far have had their respective concepts revealed to us (Panth - War, Taric - Protection, Zoe - Change, Mihira - Justice), except for two of the most prominent and original ones: Diana and Leona’s Aspects of the Moon and Sun. For such well known characters in the Targon mythos, it is strange how their celestial concepts have remained such a mystery to this day. However, looking at what we know about Aspects and celestial concepts combined with information from various sources such as information such as the Runeterra map release, it is possible that the ideological concept behind the Moon is Truth, and that the concept behind the Aspect of the Sun is Faith/Devotion.
#The Aspect of the Moon: What we know about the Lunari:
A good starting place to understand the celestial concept behind the Moon would be to look at the people who claim to be the celestial’s followers: the Lunari. We have two important insights into the people that consider themselves Lunari:
> “The Lunari chart celestial movements to divine the future. Certain priestesses wear necklaces of mirrored moonglass, believing that reflections can reveal even greater truths.”
> “Some Lunari seers bind their eyes during the day, training their eyes to see only in darkness - for only under the pure light of the moon is truth revealed.” - Runeterran map section on the Lunari
The most prominent aspects of the Lunari seem to be their adherence and desire to discern the truths of the universe. Of course, human institutions might not always completely accurately reflect their deities as we have seen with Kayle’s position in Demacia as the Protector even though she more aligns with the Aspect of Justice than of Protection. However, it is still likely that there is a kernel of truth between human groups and the Aspects they call to (especially from groups living on Mount Targon itself, a place with the greatest connection to the celestial realm on Runeterra).
#Aspect of the Moon: What we know about Diana:
Aspects always choose humans that display some sort of personal connection to the celestial’s underlying ideological concept. Therefore, even though human institutions can often be flawed, the Aspect of the Moon’s decision to chose Diana would be much more reliable a metric. Diana must have not only proved herself worthy in climbing Targon, she must have also resonated personally with the Aspect’s ideal. One of the predominant characteristics of Diana’s life is her pursuit of truth at all costs. She was raised by the Solari and their teachings on the power and prominence of the Sun, and was raised by this even more so than even Leona ever was. However, throughout her entire youth she questioned these teachings. She spotted contradictory doctrines, inconsistencies in the Solari’s stories and explanations, and openly voiced these views despite her constant punishments and ostracization from the rest of the Order:
> “As the years went by, Diana found herself ever at odds with the elders and their teachings. She couldn’t help but question all she was told, always suspecting there was more that went unsaid in every teaching, as though what she was being taught was willfully incomplete. As she grew, Diana’s sense of isolation only became stronger as childhood friends distanced themselves from the mordant, questioning girl who never quite fit in.” -Diana’s Bio
The search and dedication to the truth even in the face of adversity is one of her most defining characteristics of her life, and if the Moon represents the Aspect of Truth, then it would be understandable that Diana would have stood out as someone who could wield the Aspect’s power on Runeterra. She endured ridicule and punishment from her adoptive family, those most closest to her, because her zeal for truth and knowledge was so important to her.
#Aspect of the Sun: What we know about the Solari:
The Moon has a much clearer case for what ideological concept it represents than the Sun does, however, there are a few things that we can glean from what we know about the Solari and what that could mean for the Sun’s ideal. What we know of the Solari is that they are wholly committed to the idea that the Sun’s light is the only source of life and light in the world. Other forms of light, particularly the Moon’s, are falsehoods and potential threats to the people of Targon and the world entire.
> “The dominant religious group on Mount Targon, the Solari believe the sun is the source of all life. To them, all other light sources are false, and a threat to the future of their people.” - Leona’s Bio
This part of Solari teachings does not reveal much to us in and of itself, however, the conduct of the actual Solari religious group (and to a slightly lesser extent, the Rakkor) when it comes to these holy teachings does. One of the recurring phrases and ideas used to describe the Solari is their unwavering, zealous faith and devotion. Generally, the celestial concepts behind the Aspects tend to be pretty amoral as they are realities of the universe as opposed to things hampered by cultural perspectives or ethics. The aspect of change is change in any and all ways whether that’s change for the better or the worse. The Aspect of War is war in its totality whether it be noble or monstrous, and Justice can be protective and or overly punitive.
The Solari are defined by their absolute zealotry and faith in their religion which might be a more unsavory aspect of the celestial’s ideal. Faith can be positive as it provides comfort and hope to those who need it. People have faith in their friends, faith in their families, faith in their own beliefs in the face of oppression, however, faith can also be used for said oppression itself. Faith can blind people to what is right, allowing them to ignore abuse and exploitation. It can be one of the most powerful motivators to help others, or it can be one of the most powerful motivators for cruelty. While the Solari are not bland, evil villains where all they do is go around killing kids in the name of their faith, they do still have a strong overzealous streak against any and all they perceive to be a threat to their Faith. If the Sun represented the celestial concept of faith and devotion, it would fit that its adherents were equally faithful and devoted.
#Aspect of the Sun: How Faith applies to Leona:
Leona’s character and backstory is quite interesting in how it could related to the ideological concept of Faith, because in her life she has shown the capacity an internal, empowering faith, and an external, oppressive faith. Leona’s story truly begins with her life amongst the Rakkor and her encounter with the golden-skinned demon boy on the mountain. The Rakkor raise all their people, including Leona, in the tradition that dictates that they must destroy any and all otherworldly creatures that penetrate through the celestial mists around Targon. Faith and adherence to these traditions must be followed for the good of both the tribe and the entire world.
However, Leona defied those beliefs when she noticed how lost, scared, and defenseless the golden-skinned boy was. She couldn’t bring herself to hurt him even though everything she had been raised to believe dictated that he needed to die. In the end, Leona chose to help the boy, and when confronted with her actions she stood firm in her beliefs even if it meant the indemnity of her whole family, the judgement of her tribe, and potentially her own death. In this she showed faith in her own judgement. Faith in spite of all that she had been taught and everything she had ever known. Given how the golden-skinned boy returned later on in Leona’s life when she climbed Targon’s peak, this moment is likely pivotal to her relationship to the Aspect. It is a moment that could be similar to the test that the Aspect of Twilight gave to Zoe before it chose her to be its next host, a moment that reveals the true content of their character and their potential compatibility with the Aspect.
In addition to the Faith she demonstrated in herself and what she thought was right, we also see the more unsavory sides of faith in Leona’s character arc. After being saved by the Solari Order and brought into their ranks, Leona took to their teachings and was caught up in how the Elders believed that she was to be the chosen one to bring balance to the celestial realm. She placed her faith in the Elders and in the Solari Order, and while she was still a just person, she adopted much of the zealous, close-minded faith of the Solari and exacted their harsh will against religious detractors. In the end, Leona showed throughout her early life the capacity for the complexities of faith and how it can be both benevolent and cruel, and it would be this personal alignment with the Sun’s celestial ideal that would define her as a worthy candidate to become the Aspect of the Sun on Runeterra.
However, there could be more to the Aspect’s choice in Leona than simply someone who aligns with its ideal. We have learned that Aspects will sometimes choose their hosts for their specific ways in which they interpret the celestial’s ideal and will therefore conduct themselves on Runeterra. Zoe is the greatest example of this, although Kayle and Morgana’s situation could also play a similar role.
> “The intention with zoe was to show that the Aspect chose Zoe because she was so naturally going to be and act like it needed it, to Literally to personify it as a physical avatar.... The aspect changed Zoe, but also she changed the aspect (it was clearly cruel previously). Pure headcanon, but I assumed when the Aspect was looking for its next vessel (in this case Zoe) that the Aspect of Twilight knew (felt? saw?) on some level (subatomic? Subconscious? Metaphysical shift? How do you explain a 4th dimensional being/concept and abstraction made real by magic?) that it needed to change” - Riot WAAARGHbobo
Myisha as an Aspect of Twilight turned the Aspect of Change markedly more cruel as she plotted against the Darkin and let loose the pain they had inflicted on mortals. Leona could have also been chosen by the Aspect of the Sun, not just because she aligned with it ideologically, but also because there was some character trait in Leona that set her apart and that would help to redefine the Aspect on Runeterra in some new way.
The current definition of the Targonian perspective of the Sun is one defined by its dogmatic and zealous Solari adherents. They are defined by a faith that is empowering but also blinding to their own ethical failings. The key moment that seemed to have defined Leona in the eyes of the Aspect (metaphorical eyes as a 4th dimensional being probably doesn’t see in ways we could conceive of) was the her interaction with the golden-skinned boy. In it Leona showed a more kind and understanding version of faith. A faith that stands up for what’s right and does so because it’s the right thing to do and that’s all that matters. If the Aspect of the Sun recognized happenings in the world (the reemergence of magic, the void, etc.), it might have known that it would need a champion that embodied a specific kind of faith. Possibly one that would be capable of mending/rebuilding religious bridges that had been burned. This would fit in line with the golden-skinned demon’s words to Leona when she finally made it up the mountain. He spoke about how he was afraid that Leona might have took to much time and that he hoped she wasn’t too late, which might allude to the way Leona was put onto a very different path by the Solari and their Elders than what the Aspect of the Sun might have wanted.
#How the Concepts of Truth and Faith Could Relate to Diana and Leona’s Relationship:
Diana and Leona’s respective Aspects of Faith and Truth offer an obvious symbolic dichotomy between their two characters. More so than simply an opposite reflection in terms of aesthetic and personality between them, the seemingly opposed natures of Truth and Faith would expand upon the differences between Leona and Diana. They are not only related to one another based on their past actions (even though said actions should be very important as emotions and real connections should always be what drive characters), they are also related to one another based on their celestial connections.
Along with the most basic reflection between Faith and Truth, there is also quite a lot of ironic potential to each other should those be the ideals behind their respective Aspects. A defining point of Leona’s story when she came back down from Mt. Targon’s peak was how she had been gifted with incomplete knowledge, mysterious visions, and half-truths. She must now seek out Diana as she is the only one with the missing pieces of information that Leona needs. There is irony in how the avatar to the Aspect of Faith is in fact the one searching for truth, and a potentially character shaking truth at that. A truth that would call into question every single thing that Leona has ever known, and a truth that would force her to face the facts about the Solari’s past crimes and its continued persecution against the Lunari.
Diana, however, would have the the opposite sort of condition. Her entire life she had been ridiculed and punished by the people closest to her for what she believed and who she was with it all culminating in her near-execution. This background would have likely eroded/completely destroyed her trust in other people, especially trust in any of the Solari. However, her own revelations from the celestials are as incomplete as Leona's, and as such they will need each other in order to move forward. Just as Leona would need to learn to accept the *truth* of the celestial realm and the Solari, Diana would need to learn to be willing to place her *faith* in other people once again. To be willing to place her faith in the woman that had tried to execute her.
In the end, each of them would need to show that they are willing to understand and recognize the importance of the ideals behind the other. The faithful must learn to face the truth, and the truth-seekers must learn to have faith. A balance and cooperation between what might appear to be ideologically opposed concepts, but are in fact simply two aspects to the mortal condition. But to bring balance to the celestial realm, Diana and Leona must first learn to find balance between one another.