Electric Nova (in case you still need ideas): Channels a powerful bolt of electricity at the target unit, dealing moderate damage and giving it a buff. The bolt then splits into waves of electricity, causing minor damage to nearby enemy units. There is a chance that hit units will receive a bolt of lightning from the main target of the spell as long as the main target has the buff, taking minor damage. There is a chance for the unit to be struck a second time whenever a unit is hit by a ring of electricity.
[You cast the spell, you damage the target and buffs him. Rings of electricity are also released from the target, damaging hit units. Whenever a unit is hit by the ring of electricity, there is a chance it will take extra damage from a shock (the lightning should come from the main target of the spell).]
Electric Aura: Static around the hero causes units stay him to take small amounts of damage. Units damaged this way take more damage from the hero's abilities based on the amount of damage taken (stackable). All bonuses are lost once the enemy moves outside the range of this ability.
[This should amplify the damage from the spell itself

]
-OR-
Electric Aura: Large amounts of electricity within the hero allows him to link himself with nearby enemy units, slowing their movement speed overtime. The slow stacks and when it reaches a certain amount, the hero will release a bolt of lightning to damage and mini-stun the unit.