Item Abilites

In the editor it only lets you add up to four abilites only.

Is there a way to make it so you can add more?

No, You cant add more.

However, you could make a trigger that adds an ability to the unit once he gets that item.

try shift-clicking the field.

it generally works on editing spells and other fields etc. so it might work

*Tries logik's way*

omg that works...
ignore my post.

Ah yes, the rule breaking shift key. One of the days i should give a unit -50 hp just to see what happens. ^_^

It becomes invulnerable, but units will still try to attack it.

i would of thought they die instantly once they are trained?

Thx for that shift tip. I was now able to complete the set items in my map :)

But what happens when you heal it I wonder?

Since the max life is negative, healing won't ever bring it above that. A unit dies when it has exactly 0 hit points.