To climb up the walls you must jump from platform to platform, but always look for a platform that is higher ... if you're on that platform you will see other ones go automatically a little bit higher and so jump back to the higher ones etc etc ...
Warning: SAVE enough! You can save (for example) after each successful progress! wink

As for the pieces of the Aleroth Archmage Set? Best to look at Lancet's Guide( and search with CTRL(control)+F) .

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !