[Xen]

Quoting from the SoS site:

4 new NPC's with their own related quests 1 new kit for the thief class 1 new stronghold over 100 new areas: both new or recycled over 400 new creatures to interact with over 400 new items, most of which can be used by the party over 20 new stores in which to shop over 30 mini-quests and 2 major quests Notes All the original NPCs as well as the new NPCs interact in new ways throughout the expansion. Nalia and the new NPC Charlotte are particularly interesting when in the same group. Additional "optional components" are available to install. If you do not install any or some of them when you install SOS, you can always run the installer again, unselect the mod itself and just choose from any of the optional components (this does not remove the mod if already installed, it simply does not install it again).