User blog comment:Capblu1/Karna Masta fight advice if you guys don't mind/@comment-29794327-20161113125549

You have to know Karna's BB drain pattern to win. I defeated him a while ago, so I don't remember quite well, but I think it goes like this:

Phase 1: Use 2 BB/SBB (Mitigation + ATK/Elemental), then use 3 BB/SBB (Mitigation + ATK/Elemental), then use all 6 BB/SBB, finally he'll drain you and then you repeat the process *note* As long as you don't use more than 6 BB/SBB, he will not drain you

Phase 2: Use 2 BB/SBB (Mitigation + ATK/Elemental), then use 2 BB/SBB (Mitigation + DEF), then use all 6 BB/SBB, finally he'll drain you again then you repeat the process *note* As long as you don't use more than 5 BB/SBB, he will not drain you

Although, like I said, I haven't faught him in a while, but I think that's the pattern, if not then, it must be 5 BB/SBB in phase 1 and 4 BB/SBB in phase 2. Phase 3 is pretty much self-explanatory.