The only things I can think of related to Rezan were the few quests in which you interact with him and I want to say the quest where you uncover massive devilsaur bones that might of had a connection to him but I could be misremembering that quest as being the bones of his mother or something else.
To me, I think Rezan being the “Loa of Kings” is more along the lines of a Loa of those who lead and protect their community.
He is also referred to the “God of the Hunt” which is similar to Gonk who is the “Packstrider, Lord of the Hunt or Lord of the Pack”. To go outside of the Zandalari pantheon of deities, Goldrinn is the “Spirit of the Hunt and the instinct to protect family and gather food”. I mention this for a reason.
All three of these beings are powerful and very high up on the spiritual ladder. Gonk is powerful enough to where he wanted to offer his power to Rastakhan when Rezan died, but did not want to intervene with the Loa of Death. But this still shows that Gonk (and im sure other Loa) is high up enough in terms of what he can do to be something fit for someone as long lived and powerful as King Rastakhan.
And Rezan and Gonk are rather similar. I mention Goldrinn, because Goldrinn is a wolf. Wolves are often characterized as pack leaders, family heads and ‘alphas’ in many spheres. Goldrinn is no exception. He represents the pack, the hunt and instinct to protect. We associate wolves with family, with survival and with structure in the natural world.
While possibly unintentional in their creation, to compare them all still is worth doing so. Rezan is the Loa of Kings. Who, yes, a king leads a nation of people. People who need to have support in each other and remain safe in order to remain strong. They have a lot of things to be proud of. They are long lived, advanced, are successful in trade , art and history and have lasted for many years unchanged. (Much like the inspiration for their whole look being from ancient Aztec designs of their well designed systems and success in many areas in their way of life)
But I believe it has less to do with being empowered with nationalism. I think it is fair to say that the Zandalari take extreme pride in who they are to the point of excluding many outside influences, especially considering they were …well…antagonists for us in the past in Pandaria. There is a lot of pride behind the term “Zandalar Forever” , and it very well could help in the surge of power connected between Loa to Prelate and Loa to King.
Because without faith in something, the “Light” cannot really respond to you. Rezan is a source of the energy for the Prelates, and him being the Loa of Kings, belief in him could be attributed belief in their people. Which…I would certainly hope so. Why become a prelate, a decorated and powerful spiritual warrior dedicated to protecting their people…not want to believe in their nation?
But the term nationalism I think is the wrong word for this. It brings too many negative points for me. Even though the Zandalari have been very reclusive in the past and limited a lot of their interaction with the outside world, often being compared to basically being the snooty ‘elves’ of the troll world, I think we can take a look back at Gonk and Goldrinn again.
Gonk and Goldrinn are both powerful beings who protect the pack and the hunt, both similar to each other in their function. That overlap with Rezan only makes me think that, due to the power and longevity of the Zanadlari leaders, that this purpose of familial protection and protection of the nature around them is what truly drives the Loa of Kings.
A king is a creation made by people, but Rezan is something of the natural and untamed world. With King Rastakhans fierce nature and protection of his people, he reminds me of a father, a pack leader, a person who has the instinct to protect their pack. Their nation.
They are a surviving nation of ancient people, based off of a people I wish never received the fate they did that is so easily glossed over in history text books and are reduced to alien conspiracy theories.
Patriotism is not inherently a bad thing to have and I think a large part of the strength is derived from the pride and love of their own people, but that is only a part of the larger structure. Rezan is not the Loa of Zandalar or of Pride or of Nationalism.
He is a Loa of Kings, of leadership. And just like Goldrinn and Gonk. He is the Loa of the Hunt, and of the pack. Of family. Of safety. Of the will to press on against all odds and the willingness to survive on a grand and cultural scale.
Their legacy as an ancient people will live on, Zandalar Forever.