The blessings from several Dragon Kings are quite powerful. Although there isn't a blessing of eternal life, it's not necessary to insist on it. Eternal life doesn't mean invulnerability; rather, it can lead to a drastically low birth rate, which isn't beneficial for the development of a race.
The Ancient Elf is the best example. It takes too long for the Little Elves to nurture into Elves.
The Mother Tree can attract numerous birds, and when the time comes, there will not only be a massive army of birds, but also Starfire can recruit them. Starfire's Hunters and Beast Tamers are in for a treat.
The blessing from the Red Dragon Queen grants the Ogres super intelligence, which is also a good thing.
This is highly appealing to other races as well. In this era, who wouldn't want pureblood offspring? By becoming citizens of this land, they can be blessed with pureblood and even stronger offspring.
It plays a very crucial role in expanding Starfire's population.
