Modify Life with Behavior

[Terrabull]

I am trying to take the Defensive Matrix behavior and alter it so that it reduces a unit's max life by setting the value to a decimal. When I place the new behavior on my unit in the data editor then test the map, the max life doesn't change. Right now there are no requirements because I'm just trying to get it to work.
I noticed there is an effect for defensive matrix, but I don't understand what it does, or how I would put that effect on the unit.

Any help would be greatly appreciated.

 

[Rainther]

I recall there to be a tutorial about this thing in the Sticky on this forum (the tutorial's called "Buffs").

 

[Siretu]

Create a behavior, make sure the type is "buff" not "attribute" or something else.

Go into Behavior - Modification.
Go to the unit tab.
Scroll down and find the field related to max health fraction or something. Edit it.
Give it to your unit to test it.