Auto-translated
With all due respect to Arantir, I think it's Kha-Belekh, because as far as I know, the demon lords were equal to the elemental dragons of Ashan.
Added 20 minutes ago
His Eminence is greatly mistaken about Kha-Belekh and his power.... I am, of course, a complete noob in Heroes 5 and 6, and I haven't even completed all the campaigns, but nevertheless, I dare to hope that I have a good understanding of the mythology of Ashan. Let's start.
1) Elemental dragons are equal to the Lords (Rulers) of demons both in status of birth (the firstborn from their Primordial Dragons) and, possibly, in strength (but we know that good must triumph over evil, so all the Lords are dead (are they dead?? - I'm not sure, but rather yes than no), or, at worst, overthrown and deprived of any power).
2) There are not 7... not 8 Lords, but exactly 6!! Let's count:
Dragons: Earth - Silanna, Water - Malassa, Darkness - Shalassa, Fire - Arkat, Air - Ilat, Light - Elrath.
Rulers: Lord of Madness and Fear - Ur-Jubal, Lord of Pain and Sadism - Ur-Targgal (I might have confused the first two - I'm too lazy to launch the game), Lord of Procreation (and, presumably, lust and debauchery) - Ur-Aziel, Lord of Devouring (as well as hunger, gluttony, and another candidate for the role of Lord of Lust - as sexual hunger - I read about this somewhere) - Ur-Vomoch. And probably the two strongest Rulers - Lord of Destruction - Ur-Krag and Lord of Hatred - Ur-Hikon. That's all. Proof??? Well, launch the game and read the biographies of the Inferno monsters (I'm talking about the sixth game), and everyone has known about the dragons for a long time.
Added 59 minutes ago
3) So, all the Lords are overthrown, or dead (most likely the latter - for the common good). But we don't know how this happened, since the authors of the world of Ashan didn't tell us. We can only speculate about how it happened. I have two opinions on this: Either the Elemental Dragons killed them during some Great War. In this case, all the Dragons survived, and all the Lords died. This means that the dragons are still stronger... Perhaps, because Ashan is stronger than Urgash. Or maybe the Dragons won simply because good must always triumph... that's the whole reason. The second option is that they killed each other, which makes sense, since they simply could not get along with each other. But in this case, one of them must have remained as the winner... Perhaps this happened as a result of Kha-Belekh's cunning intrigues, but we don't know. Perhaps Ubisoft, or someone else, will someday provide us with an official version of everything that happened in Hell..., that is, in Shio, I meant
Added 32 minutes ago
4) About Kha-Belekh. This is perhaps the most mysterious character in Ashan. His rise to the position of Supreme Ruler of the demons is also mysterious. In my opinion, he called himself nothing less than Emperor, hmm... Who was he originally?? There is an opinion that he was a human who went over to the service of Chaos... Or maybe an elf, which is less likely. But the fact that he was originally created by Urgash as a Lord is even more unlikely. This is hinted at by his name. Look, all the names of the Lords begin with the syllable Ur - presumably, in honor of their parent, Urgash. He cannot be eternal in any way, even if all the Lords are killed, and he, excuse me, is a league below. Or even two leagues below. And certainly not all-powerful.... He could not, in any way, defeat 6 demon lords with pure strength, who "play" in the league of Elemental Dragons. Maybe they were weaker than the Dragons, which is not a fact, but the difference was definitely not significant: Dragons - the first creations of Ashan, Lords - the first creations of Urgash. As I said, this is a big (for me) mystery, how such a reshuffle in the hierarchy of Shio could have happened.
5) Sar-Elam... This is also a mysterious character. Most likely, he really achieved the consciousness of Ashan on his own, but perhaps Ashan helped him in this. Be that as it may, he was the most powerful human mage of all time in Ashan, even before becoming the seventh Dragon, and in general, the most powerful mortal. He is not an elemental dragon, of which there are 6, since he was born a human, but this did not prevent him from creating the prison - Shio, and sealing all the demons there, albeit with some inaccuracies, from imps and lesser demons to Lords, and even Urgash himself. This is also a mystery to me. Apparently, there was strong magic.
6) Your Eminence confuses the Demon Lord and the Prince... Arriban and Azkaal are not Rulers (Lords), they are "just" their main servants, Arriban - the Warrior of Ur-Hikon, as he himself introduces himself, and Azkaal - the right hand of Ur-Krag. As far as I can tell, at one point, one Lord could have only one Prince, but they were not eternal (however, it turned out that the Lords themselves were not eternal....). Also, another Prince of Destruction is mentioned - Abaddon (in the biography of the Inferno hero, the Warlock Zheddit). When he reigned - it is unknown, most likely, after Azkaal was overthrown (the poor fellow was imprisoned in a stone). Most likely, the Prince appointed himself, as the strongest of the followers of some Lord. Perhaps the Lord appointed the Prince himself, the most worthy, in his opinion. This is also unknown to us, and we can only guess about it. So, in terms of personal power, Kha-Belekh, in my opinion, could not even compete with the strongest of the princes - Arriban and Azkaal (remember how he feared the latter in the campaign about Kirill). This is where the "two leagues below" came from. So, the power of Kha-Belekh is greatly overestimated by you. Yes, at the time of the events of the fifth heroes, he was the most powerful demon, perhaps. But all 6 Lords disappeared somewhere (probably killed, but by whom??). Nothing is said about what happened to Arriban (did he die after his defeat by Duke Anton) and Azkaal (probably still shares one body with Prince Kirill). There are simply no such powerful entities in the fifth heroes as the Leaders from the sixth, who, I repeat, are a league higher than even the most pumped-up heroes. They don't even need an army to defeat a not very large enemy army. Of course, I think that a hero with uber stats, the maximum in the game, as Kha-Belekh should be, can defeat a Leader (boss) and with a small (relatively) army, but still...
7) Well, and of course, of the "heroes" presented here, Kha-Belekh should be the strongest. And Railag - Agrail - is really a strong mage, one of the strongest in Ashan, approximately on par with Zehir and Merkel, and possibly close to them Tieru, Cyrus (by definition) and Arantir. It is implied that Kha-Belekh's magic is no weaker, but this is not very well shown in the game.
Added 21 hours 4 minutes ago
As always, I confused Malassa and Shalassa.... I apologize.
