It's amazing how fast the ability kills go by if you refuse to equip any weapon other than the hilt of the sword! Again, unless they patched it out after I did mine. It will take somebody having done it more recently to confirm. I did all 3 on The Dark Beyond. Get to the point of "We've woken the Hive!". Hilt everything except the Knight (safest way). Go to orbit. Wash, rinse, repeat. IIRC, I was getting 6-7% each run into that little 'grindfest'.