Key insights
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A Baldur's Gate 3 player used Flesh to Gold to easily win the Emperor Battle in Act 3.
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You can get this spell in Act 2 by handing over 5,000 gp to Gerringothe Thorm.
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It's an expensive, one-time transmutation, but if the dice are in your favor, it's an easy way to take care of tougher enemies.
In Baldur's Gate 3 there is an incredibly rare spell called Flesh to Gold, a one-time level 6 transmutation that permanently turns your target into gold if they fail a saving throw within three rounds.
You've probably never seen this spell before unless you were actively trying to get it, but one player made sure to pick it up before Act 3 so he could trap the Emperor.

Related
Wyll is the only character from Baldur's Gate 3 that I want to see more of
The Blade of Frontiers deserved so much better.
To free Orpheus, you must fight your dream guardian, who is actually a mind flayer. It can be a tough battle, especially on higher difficulties like Tactician and Honor modes, but Flesh to Gold can make it a breeze as long as the dice are in your favor.
How to get meat to gold in Baldur's Gate 3
In the second act, you'll encounter some less charismatic Thorms, especially compared to Ketheric. One of them is Gerringothe Thorm, the keeper of the coins. You can find them in the Reithwin Tollhouse.
She demands gold from your party immediately, but if you give in she will only demand more. Most players will probably attack them at this point as the only other option is to give them all of your gold. But if you have more than 5,000 gp with you and hand it all over, you will receive the signed trade visa.
This unique document offers you safe passage to Baldur's Gate, but more importantly, it is the only way to turn flesh into gold. They can use it on the Emperor, or perhaps even let Ketheric suffer the same fate as his ancestors.

Baldur's Gate 3 is the long-awaited next chapter in the Dungeons & Dragons-based RPG series. Developed by Divinity creator Larian Studios, it puts you in the middle of a mind flayer invasion of Faerûn, over a century after the events of its predecessor.