It really has to be built in this order for the build to work, otherwise i highly recommend trying it out
PASSIVE - Every 1s you gain a stack of Demise, causing your next damaging ability that hits an enemy god deals an additional 1.5% of your Magical Power in damage and remove all stacks. This effect stacks up to 20 times.
Evolved Warlock's Staff
PASSIVE - On successful hit of an Ability you gain 1 stack. At 3 Stacks your next Ability that damages an enemy God will deal bonus damage equal to 25% of your Magical power to each God hit, and will heal yourself and allies within 20 units for 30% of your Magical Power and will consume the 3 stacks.
Book of Thoth
PASSIVE - You permanently gain 10 Mana per Stack, and receive 5 Stacks for a god kill and 1 Stack for a minion kill (max. 75 Stacks). 7% of your Mana from items is converted to Magical Power. At 75 stacks this item Evolves, gaining 10 Magical Penetration and 3% extra Mana to Power conversion.
PASSIVE - Your abilities deal an additional 2% of the target's maximum Health as Magical Damage. If the target has over 2000 Health, your ability bonus damage scales up. This effect reaches a maximum of 9% Maximum Health damage at 2750 Health. Subsequent hits on the same target do half the bonus damage for the next 3s.
PASSIVE - You gain additional Magical Power and Lifesteal scaled from missing Health. This caps at 100 power and 20% Lifesteal at 25% Health. <n>GLYPH - Every 15s gain a stack of Hunger(max 3). Abilities cast within 30 units of enemy gods consume a stack, dealing bonus damage equal to 0.5% of their max HP for each 75 Magical Power you have. Each god damaged by Hunger provides you with a shield of 0.5% of your Max HP for each 75 Magical Power you have. This cannot exceed 35% of your Max HP.