Can't enter fire or frost giant tower

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I can't enter either the fire giants or ice giants tower.

Cassum, in Torbury, says I need a key or map from the Hill Giant tower.

However, I have the Treasure Key, found on Norna, king of hill giants.

And, I've searched the Hill Giant tower for hours.

Is there something I'm missing?

Might my game be bugged?

I've got the Chalice and the Dragon Scroll.

Thanks.

[Bannerdog]

I'm unable to enter the fire or frost giant towers.

Cassum (or whatever his name is) in Torbury says I need a key or map from the Hill giant tower.

However, I have the Treasure Key from the Hill Giant King.
I've spent hours in the Hill Giant Tower looking for something I could have missed.

I've also done other parts of the quest.
I have the Chalice and the Dragon scroll.

Any help appreciated.

P.S. The only uncompleted quests in my Journal are:
1) Obtain an item from the Hill Giant tower (key or map),
and deal with the Fire and Frost giants.
2) Have Cassum translate the Dragon Scroll - which he has agreed to do if I take care of the giants.

P.P.S. In addition to hours searching the Hill Giant tower, I've gone to every town, and back to Knights Keep, seeking something I haven't done, but that the journal doesn't specify.

[God]

I believe you have to go up north and cross the mountains to get to the slaver city at this point.

On top of them, you'll find my commandments ... Oh, scratch that, it's for the other one.

[BlueSalamander]

Hi there, there's a hidden room in the underground level of the stronghold of the Hill Giants. Let your party walk along the walls and you'll find it soon. You should also be able to see a dark unrevealed area on the area map screen. The item you need is in that secret room. Cheers

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Blue Salamander, thank you very much!
I found it before I saw your post, but you're absolutely right, and might have saved me lots more frustration.