Upgrade which adds abliity to units?

i browsed the upgrades of the default game like cannibalize and i cant see any effect to it related, all fields has "none" on their effects, so how did they do it so that when u research it, it adds the ability to the ghouls?

i want that a trigger will gives units a permanent ability, like cannibalize
help?

The Ghoul and Abomination units have Cannibalize, it's just grayed out because the ability has been set to require an upgrade. The upgrade itself is just a placeholder.

You can also use Unit - Add Ability if thats what your looking for.

johnfn is refering to a trigger action btw. Just incase you didnt know.

ohhh i didnt see "requirements - cannibalize" there
so in order to add it, i put - set research level for unit of "cannibalize" to 1
?

Yes, one way is to give the ability to the unit in the object editor and make it require an upgrade, and then activate it in-game by researching the upgrade. Another way is to make an ability that doesn't require an upgrade, but not give it to the unit in the object editor, but rather with triggers in-game.

Eh. i'd just use an upgrade. i try to avoid using triggers for stuff it's not nessecary for.