I will be specific as you clearly just want to finish now. It contains spoilers, if that worries you/anyone do not read
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You will find a large cavern that if you look up has a hole in the roof, use the rope/hook there.You will need the Serenity Helm from the Shaman in Trynton. This helmut stops the entire party going insane when the character equiped with the Serenity Helmut takes possesion of the Destiny Dominus (that is specific because it is a must, the Serenity Helmut won't work otherwise).
You will need a plank from the wrecked boat on the beach at the entrance to one of the sea caves. This plank will be required to form a platform at the bottom of a slippery slope.
You will need to search skeletons to find a pair of spiked boots (for the slippery slope) and also to find a key to Martyn's Crypt Door (I think thats where you find the key anyway).