Stubborn Head is a magic Helmet in Pathfinder: Kingmaker.
Instead of giving 4 Saving throws against Death descriptor it gives +4 DC to such spell instead. (Last Version:2.1.7b) (Kingmaker)
Also gives unlisted +4 competence bonus to Intimidate.
Source[ | ]
Acquired from book event of Nok-Nok and Goblin King's duel in Goblin Fort.