farm Primordial Lanugos in Babylon or Andromelus

Blood Fort has 118 APD while Andromalius has 133 APD. While Blood Fort has lower APD, maybe it would be best to farm Andromalius since it also gives QP, skill gems and other mats. It also matters on how fast you can clear the nodes for your farming convenience.

yes, you can. you just need to sacrifice all your time and resource on Saber Pillar... Just like I did

If you can wait until Valentines event, that shop will have 20 for sale