I found myself in need of a lot of Shadow Cores and today I was suprised to find some many in so little time - love it.
Guide to Farming Shadow Cores
- Go to D1 (O>L5>H4>E4>D1).
- Do endurance on D1 to unlock Ritual.
- Do W1J (because short and easy).
- Setup towers, move poision towers to shadows and infuse with beams to murder faster.