EMS is an Enhanced Magic System for NWN, which fixes literally hundreds of bugs in the BW scripts, and also moves a lot of spells closer to PHB. It is the only complete system with correct behavior for Dispels, AOEs, SR, etc, and is also PW-friendly. This is a 'drop-in' HAK, with notes for builders who want to integrate it with their worlds, and works with SOU/HOTU/CEP though none of them are actually required.
Thanks to Savant, author of the superb Aielund trilogy; and the admins and players of the Dreu Noctem PW; for their help with testing and balancing the system during its development.
As of v1.02 (23 Dec 04) the zip contains two files: hak/EMS.HAK docs/EMS_Changes.TXT and should be expanded into your NWN dir with pathnames on.
There's also an EMS_FAKE.HAK file included to turn off EMS in SP play if you don't want it: just rename the real EMS HAK to something, and EMS_FAKE.HAK to EMS.HAK.