What role do the Wyrdkeys play in Aelin's quest?

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What the Wyrdkeys are

1. Three fragments broken off from the Wyrdgate, a barrier between Erilea and the Valg dimension.
2. Individually, they can enhance or shift magic (for example, altering fire magic into shadowfire), open portals, even suppress magic on large scales.
3. Combined and properly used, they’re essential to forging a Lock—an artifact that can permanently seal the Wyrdgate and keep the Valg from invading among other catastrophic possibilities.

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Their role in Aelin’s quest

1. The Lock quest: Aelin must gather all three keys to bind them to the Lock in order to seal the Wyrdgate permanently.
2. Steep cost and sacrifice: To forge the Lock, someone from Mala Fire-Bringer’s bloodline must give everything—including potentially their life. Aelin learns this burden falls on her.
3. Hidden and dangerous: The keys have been concealed for centuries—one in an amulet, another was implanted in Kaltain, etc.—and they’re sought by powerful enemies like Maeve and the Valg. They also have adverse effects on wielders (dark aura, magic corruption, etc.).

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If you want, I can map which characters currently possess which Wyrdkeys and where they’re headed next.