I think some items that cater to casters would be a good addition, such as (any values/names are obviously just pulled out of thin air for examples)
Power Staff - While equipped abilities that have values are raised by 10%
-- So Fireball would doo 330 instead of 300, Queen's shield would block 10% more damage, Sedna's Heal, etc.
Double Staff - High mana cost to use, on use next spell cast within 10 seconds does double damage
I just think, there should be more items that cater to caster type Demigods. You can only have so much mana. As it is now I seem to find myself just buying citadel upgrades instead, and while that isn't bad of course, casters should atleast have decent options comparable to the Demigods that focus on direct damage.