Gifted to the players by Cindra of the Onyx Assembly.
The key has a metallic-green shimmer and is made out of alloyed metal.
The blade of the key has an inscription in an unknown language:

A wyvern key is an artifact that can be inserted into any door. As soon as the key is turned into the unlock direction and the door is opened, the key becomes ethereal and vanished and the door will lead to the Room of Many Doors as long as it is open.
When the door is closed again, the key can be removed which implies that the key cannot be taken into the Room of Many Doors.
It is unknown how many Wyvern Keys exist, where they come from and who built them or the Room of Many Doors.
The key radiates a magical auto when observed via a Detect Magic spell.
See on D&D Beyond
Gifted to the players by Cindra of the Onyx Assembly.
The key has a metallic-green shimmer and is made out of alloyed metal.
The blade of the key has an inscription in an unknown language:
