Forgotten Realms creator Greenwood's fourth Band of Four book (after 2002's A Dragon's Ascension), with its gory and repetitive battle scenes, will please the faithful, many of them role-playing gamers, but fans of gentler fantasy had best stay away. Now in the position of Overdukes, sorceress Embra Silvertree, warrior Hawkril Anharu, thief Craer Delnbone, sorceress Tshamarra Talasorn and ex-regent Ezendor Blackgult must battle the priests and sundry servants of the Serpent, the wizard Ambelter and various barons in an effort to bring peace to the realm of Aglirta and keep the king on the throne. The scheming of the priests centers on a wine-induced blood plague, which compels people to spontaneously kill others before dying or to change into mythical beasts that remain under the priests' control. The action is fast and furious as the Band of Four, wielding the Dwaer (stones that amplify magical power and intensify spell-casting), contend with their double-crossing enemies as well as spontaneous attacks of the blood plague. Given the many new characters and others from previous volumes, the Dramatis Personae section at the back is particularly useful, but only if discovered beforehand. (May 28)