Eilistraee's Song is a project, which expands the plot of Eilistraee - the deity of drows that rebelled against Lolth the Spider Queen. Eilistraee is actually mentioned in original BG2:SoA by Solaufein after we decide to let him go, but still players were never allowed to get know the full tale. This mods adds content for players who decided to spare Solaufein's life and let him escape. That means that your decision in Underdark actually has a consequence in the later game. I think it's a pity in original BG2 your decisions in Ust Natha don't really matter in the later chapters. When Solaufein returns to you later, after escaping Ust Natha, he tells you how grateful he is. Eye for an eye, and friendly arm for a friendly arm - he tells you about a new place, where you can ask for help with getting your soul back. Mod includes 6 new areas, 21 new items (2 of those are available through Cromwell) and obviously some new quests - it's up to you if you wish to complete them or focus on real quests and get your soul back. On the areas you may hear new music themes. Also, there is a new kit available by completing one of minor quests, although there are some requirements (female, cleric - baseclass, multi- or dualclassed, non-evil character, elf or half-elf). Yes, it's a bit harsh, but that's what the D&D book says.
-This mod is a WeiDU mod, so you can install it as any other WeiDU mod. Unzip the archive to your Baldur's Gate 2 directory and run Setup-Eilistraee.exe -Note that this mod requires BG2:ToB installed! -Mod is compatible with Solaufein NPC -If you're using BG2EE START A NEW GAME to find the clearing on the map.