[Master Shake]

I empowered a Blood Mage to Blood 4 so that I could make the two +1 Blood boosters listed in the back of the manual (Armor of Thorns, and a 1h weapon whose name escapes me atm). Both items are listed at Construction 4, and I have Construction 6 researched.

When I order the Blood Mage (now Blood 4) to forge item, these two path boosters are not listed! Other blood items (like LIfelong Protection) are there, but not the boosters. Help! Do I need higher blood magic, or perhaps higher Construction????