Summons a Necronomicon Warrior and a Necronomicon Archer. Lasts 35 seconds, costs 50/75/100 mana, and has a 90/80/70 second cooldown.
Currently, Necrobook's active remains the same as far as cooldown and manacost. I think it should improve per level. Manacost increases as well (+25 per level) but, by the time you get Necronomicon Level 3, 50 more mana cost will be doable. This manacost increase is just a minor balance as to not have a buff on cooldown alone. What do you think?