In Kingdoms of Amalur, you have "Skills" and "Abilities". If you later want to change what you picked, you need to visit a fateweaver to respec. (This is also how you can pick where the original 3 pre-assigned points go)
But to actually do this, you need gold. How much gold? Well, it seems to vary. Is it a linear scale with level? Does it go down with time? Does it go up each time you do it? Does it vary with difficulty, perhaps? Does the formula change even between fateweavers, perhaps?
How does the game determine the cost to respec?