Demonology Tome: Master Demonologist

"Grants both the Warlock and the summoned demon an effect as long as that demon is active. Imp - Increases your Fire damage by %, and increases the critical effect chance of your Fire spells by - Reduces Physical damage taken by - Increases your Shadow damage by %, and increases the critical effect chance of your Shadow spells by - Reduces all spell damage taken by - Increases all damage done by %, and reduces all damage taken by 06s2%."