"In my understanding, the heroic profession is quite similar to my past 'soldier' path; the core should be consistent, right? My heroic profession starts at the fourth tier..."
Xue En's main path is "soldier," but unlike Lu Ping'an's "battlefield commander/warlord" path, he follows the line of the commanding general... most people call it "battlefield chaos stick."
The soldier profession has two skills: one increases battlefield survival rate with war instinct, the other is all weapon specialization... obviously, the former is the core of this profession.
Understanding war, merging into the battlefield, mastering death, that's the real core of this profession.
And in controlling the war itself, there's Lu Ping'an with the warlord path, but the main force of the battlefield has always been soldiers; one general commander is enough... over ninety percent of soldiers follow the path of increasing battlefield survival rate.