- The tomes you study reveal ancient and dangerous secrets. Your familiarity with these books lets you access their power more easily and make your conjurations and summoned monsters more fearsome. Benefit: You gain a +1 feat bonus to implement attack rolls that you make with a tome. This bonus increases to +2 at 11th level and +3 at 21st level. In addition, enemies adjacent to your conjurations or summoned creatures grant combat advantage. An enemy that is immune to fear is immune to this effect.