Lancer: Invigorate, Blood for Blood
Marauder: Fracture, Mercy Stroke
You get one more than that, but these are all things you need to have. Blood for Blood unfortunately requires you to get Lancer to 32, but it's so incredibly worth it.
As a monk you can only take cross-class abilities from these two classes.
If random outcomes aren't acceptable to you, then don't play with random people.