The political strife among the elves was always intense.
Not to mention the unexpected appearance of a Dark Elf Troops in the city center of Eternity Island causing a terrible slaughter, it was the Queen's husband, the true heir of the Elven Royalty, who was assassinated in the most heavily guarded hall of the Royal Palace.
The Elf Queen could have entered the eternal life of the Elf Deity System long ago, but none of her children, the true heirs to the Royal Bloodline, could take over the position of the King.
The truly capable Princes and Princesses died under mysterious circumstances, especially that strongest Princess, who died during her travels, and everyone was clear about the murderous intent involved.