In the first years of the First Era, a powerful race of Elves called the Ayleids, or the Heartland High Elves, ruled central Tamriel with an iron hand. The high and haughty Ayleids relied on their patrons, the treacherous Daedra Lords, to provide armies of daedra and dead spirits; with these fearless magical armies, the Ayleids preyed without mercy upon the young races of men, slaughtering or enslaving them at their whim.
But if the Empire should slacken in its dedication to the Nine Divines, or if the blood of Alessia's heirs should fail, then shall the barriers between Tamriel and the Daedric realms fall, and Daedra-worshippers might summon lesser Daedra and undead spirits to trouble the races of men.
Especially due to the fact that the line has been broken several times.
Wasn't there a source that says Lorkhan created the Amulet? I can't find it...
I don't know about Lorkhan, but I do believe the Ayleids were known to be a proud race, and many of the Daedra are typically treacherous.
But one of the things is that while the King who resided in White-Gold worshipped Meridia, the Amulet's gems represent the Eight.