the black stones

[fitzyfitz]

So you think those dragons were used for war?
But I think I have established a list of the uses of the stone :
By default, this stone takes memories but these memories are used differently :
1)Giving life to the stone by giving your memories (more likely your life) which is used to make stone dragons.
2)Putting your memories in it without melting into the stone ( I think) to use it to store your memories which directly go in the spirit of the next person who use the stone (memory stones)
3)Via the skill it teleports you to another destination, it is the only one which doesn't take memories but, used too frequently it may be dangerous (look at poor Fitz in Fool's Fate....) It's of course the Skill-Pillars
4)It is a little bit like the number 2 but it does not take the memories of one single person but of many and the memories doesn't stay in the mind of the user forever but fades when you don't touch the stone and reappears when you do. It is the black stone walls used by Fitz in Kelsingra (Assassin's quest) and lady Carillion Karrock and her Jamaillian friends in the buried city (The Inheritance)

['thul]

Stone dragons were designed as art, no more, no less. That they could be used for war was a six duchies invention. Of course, elderlings might've invented it as well, but that is uncertain.