Flavour
The demonologist is a wizard who has embedded within himself demons, letting them possess his form for short times in order to learn of their strengths, their weaknesses, how to use their abilities and how to combat them.
Demonic Anger (These are monster abilities from the toolset)
[ulist=disc]Aura of Fear - Demon Aura
Lift - Demon Lift
Scatter - Demon Scatter
Corruption Blast - Archdemon Corruption Blast[/ulist]
Demonic Strength (Demon area of effect buffs)
[ulist=disc]Aura of Weakness
Aura of Healing
Aura of Fire
Aura of Corruption[/ulist]
Demonic Defense (defensive passives. These would be tweaked to ensure the PC is balanced)
[ulist=disc]Shield of Hunger - Demon Properties
Armour of Sloth - Demon Resistance
Helm of Pride - Pride Demon Properties
Mask of Rage - Archdemon Properties[/ulist]
Might add more as the need calls for.