Guild Wars 2

So Wilting Strike won’t work if target already has weakness?

Wilting Strike
Activated attacks abilities for pets cause weakness. This effect will only occur once on each target affected by abilities.
Weakness (4s)

It means that if forest spider F2 shoots 3 times or drake F2 shoots 5 times , It will apply weakness only once.
So you might want to use this trait with eagle and Loud Whistle, its 100% uptime weakness on a single target. Or hound for aoe weakness(600 radius) every 16 sec.

I actually really liked the cripple from intimidation training, but yeah, ok, weakness will do too.

If you constantly apply weakness to a power-based build, you are largely crippling their damage.

Combine this weakness with weakness from Axe #3 when your pet hits.
Combine weakness with protection for extra fun.
If you then also have some decent self-healing … awesome.
If you have cleanses … welcome to tankiness.