I want to get a special ability for the Demon, but I can't understand why I'm not being given FIRE ARROWS for the ballista along the "Attacks" line. Is it necessary to have machine mastery to obtain them? Or is simply having a regular ballista enough?
I have everything needed in terms of logistics, everything related to darkness, everything related to attack, except for "fire arrow." I have three special skills and have unlocked the gate opening. I'm standing near the mentor, but he still won't give me fire arrows.