SC2Mapster

@thenamesgregg: Go

I'm not sure how to check height collision. Maybe ask someone whos made an F/TPS.

For the missile though...

Create The Following

• Unit - Missile (Or just duplicate 1)
• Ability - Effect - Target
• Effect - Launch Missile
• Effect - Persistent
• Effect - Damage
• Effect - Search Area
• Behavior - Buff

Buff

• Period: .01
• Duration: -1
• Periodic Effect: Search Area

Search Area

• Range .3
• Filter: (Only check Enemy)
• Effect: Damage

Launch Missile

• Ammo Unit: Unit

Persistent

• Period Effects: Launch Missile
• Period Count: 1
• Target - Location: Target Point (Might be Location - Offset - End)

Unit

• Behaviors: Behavior
• Mover: Generic Missile Mover (If its not already)

Ability

• Effect - Effect: Create Persistent

That should get you started, there may be some kinks there though.