United Kingdoms

Overall, compared to a regular bow, crossbows are completely broken. They have base damage equivalent to a bow after two upgrades, armor penetration, the ability to upgrade the archer skill tree, and the ability to move and shoot simultaneously. At the same time, the range is the same as a bow, there are no penalties, the only thing a bow has is an additional attack, and that's only on the third branch.

Added 6 minutes later
There are many ways to balance this, as far as I understand, you were aiming for realism, and in that case, I can suggest the following: after firing, the crossbowman must perform a reload that takes one turn, which cannot be done while moving, even with an upgraded profession. In my opinion, this is not enough of a nerf, but it does convey the crossbowman spirit - fire once, kill armored knights, and stand vulnerable.

Added 12 minutes later

Profession: Warrior I
Specialization: Leithen Sword III

Doesn't Locken have one free skill point that can be spent on anything other than the profession? Or is a separate point spent on unlocking it?