Dragon Tears was a non members only mission on Spineworld.
Ravensilk at Dragon Port needs a Dragon Tear and gives a pet to the user to rent for 20 minutes. The pet he gives is called Hirrou the Polar Quank.
Go around Dragon Port and make the pet search for a Dragon Tear. When it has found one, go back to Ravensilk.
After getting the reward, the user is able to use the pet for a short time.