A reminder, I'm lvl 50 as of right now. So I'll just post what I have, and it's your decision on how you wanna waste your points to get my build. It's best to get splinter, then grenades, and iron skin as fast as possible. Then work down the splinter and grenade list.
Impenetrable Shield
Fatal blow 5/5
Sword Master 1/2| Focus 5/5
Charge 1/1| Shield Mastery 5/5
Provoke 2/2| Threat 2/2| Party Focus 1/1
One Hand Sword Mastery 5/5
Wide Provoke 1/1| Heavy Crasher 1/1| Life's Rest 3/5
Defense Mastery 5/5| Iron Skin 5/5
Starlight Slasher 5/5
Enhanced Iron Skin 5/5
Return Damage 1/3
Last Survivor
Weak point analysis 5/5
Lesson 2/2| Strength Training 5/5
Rapid 1/1| Splinter Effect 5/5
Weakened Area 1/1| Splash Splinter 1/1
Grenades 5/5| Enhanced Strength 5/5
Witcheryerful Splinter 2/2
Grenade Witcheryer Up 2/2| Sharp Splinter 2/2
Scorching Effect 2/2| Enhanced Party Strength 1/1