Making a spell that makes units invunerbale

ok, how is this done. i based a spell of Inner Fire (named it Shadow Pact), and i want it to make the targeted unit invurnerable and give it 1 HP. how is this done?

Event: Unit is given an order targetting an object
Condition: Order = innerfire
Action: Set ShadowPactTarget = target of issued order

Event: Unit begins the effect of an ability
Condition: Ability being cast = Shadow Pact
Action: Unit - Set ShadowPactTarget current life to 1
Unit - Make ShadowPactTarget invulnerable
Wait x
Unit - Make ShadowPactTarget vulnerable

Event: Unit is given an order targetting an object
Condition: Order = innerfire
Action: Set ShadowPactTarget = target of issued order

Event: Unit begins the effect of an ability
Condition: Ability being cast = Shadow Pact
Action: Unit - Set ShadowPactTarget current life to 1
Unit - Make ShadowPactTarget invulnerable
Wait x
Unit - Make ShadowPactTarget vulnerable

Event: Unit is given an order targetting an object
Condition: Order = innerfire
Action: Set ShadowPactTarget = target of issued order

Event: Unit begins the effect of an ability
Condition: Ability being cast = Shadow Pact
Action: Unit - Set ShadowPactTarget current life to 1
Unit - Make ShadowPactTarget invulnerable
Wait x
Unit - Make ShadowPactTarget vulnerable

Funny, I think I've heard that before! (just joshin'...)

Woops!

I am new to Variables, so how would i make the ShadowPactTarget Variable, and any others that are needed? like what Varible Type?

Variable type = unit

so the innerfire must be an order type then?

Inner fire isn't a variable. It's under conditions, order equal to.... Type in innerfire... or seomthing like that, go under the abilities tab, click inner fire, and near the bottom it willl have an order thing, saying Order - Use/Turn On = X

X is what you want to use for Order Equal to... X

can it be done like
ability being cast equal to Shadow pact ?