Well, your last question makes the first a moot point, but:
I need help with a battle (Spoilers) Ygerna's memory.
Yes, FoV continues seamlessly from the end of D2:ED. DKS (PC, XBox) or Divinity 2 Developer's Cut (PC) contain a remastered version of D2:ED (some graphics updates, balancing, additional sets and unique equipment added, etc) as well as the add-on FoV. In DKS/D2:ED or with FoV installed, you can start a new D2:ED character and play through to the end of FoV, or start a new level 35 character at the beginning of FoV. Saves from the original release of D2:ED are not compatible with DKS/D2:DC due to the changes made to the game (you would be able to continue with the same character if you installed FoV).
If you are playing the PC version of the game, you may be able to get a free upgrade to the Developer's Cut version (see
here). FoV is not available separately on the XBox (too large for DLC and Larian couldn't find a publisher for a separate retail release), so you will have to get DKS in order to play the add-on.
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