For the Darkness or Shadow spells
Void Shift
Teleports the caster to a distination and slows all units within a range of 500 movespeed by (Your choise) and deals (Your choise) damage to all within a range of 300.
Shadow Path
Creates a shadow path (Just a unit with a shadow model) that moves to random directions with fast speed around the caster (Your choise on move time), the shadow path will make the caster invulnerable everytime he touches it.
Shadow Strangle
Summons shadows from nearby enemy units on the target unit dealing (Your choise) damage, damage stacks. When 10 seconds have past, the target unit will lose (Your choise) move speed and take (Your choise) damage over time. Lasts for 15 seconds.
As ultimate
Dark Chaos
Puts every friendly unit into a sleep and awakes the darkness inside them. This will turn all friendly units armor to >Divine< and their attack type to "Chaos", they will all have bonus damage (Your choise, Command Aura) and move (Your choise, Endurance Aura)% faster. Lasts for 10 seconds.
>If my ideas dont help you, please tell me<
I hope these ideas can others to!