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I've gone through the Hill Giant and Frost Giant fortresses, and defeated Sandrax, or whatever his name is (a lich). [Near to where the Chalice is found.]

However, when I attempt to enter the Fire Pits, I receive the message that I need a key.

I've spent hours searching the Frost Giant fortress for a key, and have found nothing.

Thanks.

Never mind.
I updated my Knights of the Chalice game editor to give myself the Fire Key.
Which, took less time than the hours I spent searching for it.

Hello Bannerdog!

I replied to the same question recently on the Steam forum for KotC 1: https://steamcommunity.com/app/1083760/discussions/0/4417479689923769436/

So I'm reproducing the answer here:

After defeating the Frost Giants, you need to talk to Mayor Orzal in the village of Torbury.

He will give you some gifts as well as the key that you need to enter the fortress of the Fire Giants.

Cheers! Best regards

Thanks BlueSalamander, I didn't even think I needed to talk to Mayor Orzal in Torbury Village and he'll give me the key I need to enter the Fire Giants fortress. Now it is clear.