Second profession and Soul Reaping

If i choose Necro as a second profession, do i also get Soul Reaping? Because i think that Soul Reaping is a perfect way to gain extra energy points while killing enemies, especially against larger groups of enemies. But i'm new to this game, so i'm not sure.

No. Only primary class. That's why they're called primary attributes.

I see, well it makes sense. thanks!

You can still get and use skills from the Soul Reaping attribute line. But the attribute itself will remain at 0 as you can't put points into it.