Don't understand Active off default weapons attacks

Hi, if someone can help me, I really don’t understand How work the Proc on nightblade or shaman or soldier…
i explain to you, if i use Firestrike With 12/12 on all skill tree after fire strike,
When my nightblade of shaman or soldier attack proc, all my bonus give by my firestrike was gone? or it’s additional ?
thx in advance :slight_smile: