Nork Silver Dragon Lair:

Thanks to Seville's Page

The Silver Dragon is a very dangerous creature. It has more HP than a Red Dragon, casts lightning and claws its victims. The lair is located North of the Griffon lair. You must climb up to the lair after being enchanted. Venture down to Nork -6 and find a roaming NPC. When you find the NPC, say hello. The NPC will tell you the name of a traitor. Search out Talbot and tell him the name of the traitor. This will enchant you and then you can go vanquish the Silver Dragon. If you retreat back from the rough water, you will have to be re-enchanted. Good gear to protect yourself are Silver Dragon armor and Lightning bracers. By coincidence, after you kill the dragon, you will recieve both such items.

Source: Original mirror