You didn't get any tenebrium weapons from the loot in Sacred Stone?
Ask one of your current companions to leave the party, recruit or ask one of the companions you don't use to join, and when they level up to match the main character that talked to them, use those points to have them learn Blacksmithing 4 and/or Tenebrium 3 to make a tenebrium bar and add it to a weapon.
You may be able to hire henchmen, as well, though they don't level up, so without being able to buy back the Blacksmithing bonus equipment you sold, that will make it a little harder (unless you use a CheatEngine table to just give them enough ability points; see the instructions and warnings
here, and discussion after).
New portals do not get opened in the homestead as long as it is under attack.