User blog comment:Bing445/Mobile guide/@comment-25717421-20160127190936/@comment-25717421-20160128045036

Toughness and BF do stack, unless NK changed it within the last week.

I'll likely use cores to get a 10*** HP Chest and 10*** Medusa Helmet. Fort, Ht Rst, BF, and then Hzcm, BF, ST.