From publisher blurb: This ninth book in the series takes a look at the concept of field spells, abjurations that hedge out specific types of creatures or effects, or that change the nature of the area inside the field, so that certain types of magic work differently there or are excluded. The archetypical spells of this kind are antimagic field and antilife shell. This book contains variations based on both of these spells, and new spells that widen the choice of field spells available. The book includes: 28 field type spells, ranging from 2nd to 7th level. 7 new feats to enhance field type spells.