The Blood of the Fold by Terry Goodkind

When Richard Cypher's odyssey began nobody could have imagined where his adventure would lead. Overcoming personal tragedy and becoming the Seeker, wielder of the magical Sword of Truth, Richard defeated the megalomaniacal wizard Darken Rahl and fell in love with Kahlan Amnell, who, as the Mother Confessor, wields considerable magic in her own right and presides over the Midlands, dealing justice in disputes both large and small throughout her land. 

The Blood of the Fold, a group of fanatical anti-magic zealots, have joined the forces thwarted by Richard and Kahlan. They are the unwitting pawns of a sorcerous evil from the Old World, a realm that has been magically sealed for thousands of years. Richard, Kahlan, and their allies now face the combined might of two worlds - the old and the new. This stunning confrontation threatens an Armageddon of unimaginable proportions unless Richard and Kahlan can believe in the power of their love and their faith in the Truth.