You have been blessed by Asuryan with the power to make Ulthuan anew, though actually becoming a High Elf or any kind of Ulthuan fauna is optional. Asuryan has granted you a power to revive the glory of Ulthuan like a Phoenix, allowing you to create Asur or other forms of Ulthuani wildlife (Dragons, Phoenixes, Great Eagles, etc.) from fire, with more powerful creatures requiring greater blazes. All the wisdom and knowledge of Ulthuan is known to your kingdom from the beginning, so you needn't worry about grand architecture, ithilmar forging, Lothern seamanship, & High Magic being lost arts.
While your Asur are capable of building and maintaining a complex civilization autonomously from your commands, you still have complete control over them through Asuryan's blessing, making you the most legitimate Phoenix King to ever live. Your control over them is similar to the control one has in any other Hive Mind found here, though they're capable of independent thought, and will even gain their own personalities.
You and all your residents of Ulthuan gain immortality & a natural talent with magic, no matter what world you're on.