Thermie's Tinkering is a Tinker's Construct 3 addon that adds new, ideally balanced materials with odd methods of obtainment.
Hardblood, and its fluid, Sanguine, are an early Nether material obtained by melting down Sanguine Poppys and casting the resulting Sanguine onto iron tool parts.
It possesses the trait 'Bloodthirsty,' which grants a stacking buff that gives speed, and can be consumed for healing and saturation.
TBA (Re-implementation of Bloodbone, as an alternative to pewter.)
TBA (Armor grants protection scaling with max health, while weapons deal extra damage to opponents with high health.)
TBA (A secret metal, found in only the most remote treasure hoards.)
Thermie's Tinkering adds will add some new hostile mobs, ancient tools, and other features when I actually lock in on java and figure that all out.
Happy Tinkering!