Omen

Omen's original name, was not Omen but she gained the name through her acts of usually finding shade touched dragons on her Search and dealing with them. Her mother left her in the plague lands as a young hatchling while she went off to work with Plaguebringer. Omen's Search brought her into the tangled woods. Originally she just came to Sheerivory as the clan was known to welcome outsiders. She really did not expect to become a member but a baby pearlcatcher caught her interest.
He acted much more adult then his siblings and even worse.

He would leave his pearl to talk to people before chasing back after his pearl. Worse was the feeling that, she NEEDED this pearl.
Omen waited for a moment, the pearlcatcher left his pearl and she snagged that pearl.
Darkness clouded her vision and she could see something of great power. Eyes glowed in the darkness of bright green and yellow and a white skeleton head poked out of the gloom and it was the Goddess that took her mother and-

-the pearl was clawed out of her hand and a screaming child had blasted her with a powerful shadow breath. She fell to the ground, crying.

"Why did you touch my pearl!?" The hatchling shouted. Omen had no awnser, inside though she was terrified. A primal fear woke up in her but also she felt it. She felt it. The charge was that terrifying pearl. She carefully sat up and all that could come out was,

"Because I have to protect it."

Now they're both adults, Nightmare has become a lot more cocky and she's seen him use the power of that strange pearl to strike fear into the hearts of those who would mock or hurt him. In honesty, he's not the worse pearlcatcher she could have been stuck with but also, she knows if he ever drops that pearl she would take it and hide it far far away.

Because that orb is a nightmare in itself.