Ok well, it seems like the quest has a few prior stuff to finish first. I asked a clan member and these are what he said:
-First you should do Reborn Blade quest (from Erding), otherwise Golden Lizard quest will not be open.
-Take the quest from Erding, he will send you to the Shadow (in Tomb of Kings), Shadow will open you an instance where you can gather golden parts for some medallion.
-After you've done all the steps, finish the quest at Erding.
The Golden Lizard quest opens at The Shadow in Tomb of Kings afterwards, go take it from him and you're good to go.
credits goes out to -Adana Ejderhası.