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In the western section of the caves you will have to face off against numerous undead foes. After defeating the Vescavor Queen there, you will need to enter the caves behind her.
The story quest The Music of the Abyss will have you go to the location Leper's Smile. If you do not give the scale to the Storyteller in the Defender's Heart, you can still give the item to him in later acts.
The scales can be found in the Underground Caves of Kenabres during the quest Devoured by Darkness.
You must collect at least one Terendelev's Scale and give it to the Storyteller in the Defender's Heart after rescuing him from the Blackwing Library to have its story told. It is possible to miss this mythic path if you do not fulfill all the requirements. Unlocking the Gold Dragon mythic path is a multi-step process that begins as early as the prologue and ends in Act 5. At Mythic 9, you are given the option to change your character portrait to that of a Gold Dragon with its claws crossed. It grants powerful bonuses to your attribute scores, spell damage dice, several immunities, and can allow you to permanently transform into a Gold Dragon. It is themed around redemption and forgiveness. The Gold Dragon is a late-game mythic path that can be chosen in Act 5.
The Gold Dragon is the embodiment of goodness, hope, and redemption."
"The Gold Dragon is a mighty, almost omnipotent creature that possesses powers beyond all others. Those who faltered could be redeemed, those who are lost, should be guided. The mighty magic and form of a Gold Dragon gives you the power to smite your enemies, but remember: killing is not the only option. Gold Dragon is a Mythic Path in Pathfinder: Wrath of the Righteous.