Adding Chaos

Ive read in several threads about 'adding' or 'using' the Chaos ability, which would be done as follows, from what I understand:


Or the variations such as Chaos (Grunt), etc.
Whenever I add this ability to a unit, nothing happens. What am I doing wrong? Isn't it supposed to transform the unit into a grunt (for the Chaos (Grunt) variation)?

what exactly is it that chaos does? it looks like a dummy ability to me

I think that all the usual chaos abilities have tech requirements

but what does chaos do?

Read the Ability Tut at the Tutorials section

-Av3n

Chaos let you transform a unit to another unit.

Can Chaos work multiple times? Or do you have to revert the unit to it's original, then use the other Chaos ability?

Thanks. I'm embaressed that I overlooked such a simple thing.