Use triggers... Dummy units with Storm Bolt that target units with "Pick Up Every Unit". Dummy Units are units which are invisible, have Locust ability and can be used to cast spells on units. So the unit will get a Storm Bolt ability, with the stats your original Storm Bolt ability should have. So, basically your unir casts a dummy ability which does nothing but only starts the trigger below:
Event - An Unit Starts the effect of an ability
Conditions - Ability Being Cast equal to YourAbility
Actions - Pick Up Every Unit.... (Your conditions here)
- Create 1 Dummy for (owner of (Casting Unit)) at Position of (Casting Unit) facing 0.00
- Set 1.00 seconds Expiration Timer to (Last Created Unit)
- Order (Last Created Unit) to Mountain King - Storm Bolt (Picked Unit)
That is kinda all..
~Daelin