Absolabs is the absolute worst idea for a set upgrade. I really don't see anyone jumping on the toads hammer item either. Why would you upgrade your fafnir and lose the potential tier? Terrible item. I really don't know what they were thinking with Absolabs set. I mean it makes some sense being in KMS where you can enhance to 25 stars but I don't think stars 16~25 beat tyrant gear or even MEE's.
So in the end I'm probably going to be stuck selling this sword for a year.