Necro bones normally are the crafting ingredient to give life steal for tinkers weapons, unless that has been disabled
also the Killing quest which suggest you goto a nether fort and kill wither skeles and Blazes only seems to recognize the Ender IO wither skeles, Sorry should have probably added that in last post
Okay, didn't know that about life steal. Tend to just use whatever upgrades I get along the way. Hasn't been disabled btw.
There's nothing I can do about the wither skeletons. The HQM book only offers one wither skeleton as a killing quest and 2 options, exact or type. Its already set to type which covers the widest range. Thankfully its the only quest in the book that deals with actual wither skeletons.