This tech is probably a even further advance of her normal healing tech as its seal mark from what we can see is going all over her body, and quite possibly an advancement to her already incredible strength lvls. Just my guess though.
im pretty sure its her regeneration jutsu that lowers her life span each time she uses it. Thats probably why its a forbidden jutsu in the first place.
I think if she'd used her hidden Forbidden Jutsu and not been impaled then it'd rock more. But maybe she used a clone or there is more to the Technique than meets the eye.
So far though,not too impressed but impressed none the less.
Well done Hokage though for Piercing through Susanoo and then cracking through Madara's chest,that was BA.