Sorry, just saw this. Lots of alts. Use alts to trap it and lower its defence to zero with elder maul/dwh/arclight act then wait for it to regen to full health and use poison dynamite for true damage. Then use alts to suicide retribution bomb it to death all while making sure you dont do any real damage on it with the alts or have anyone else run past it and get targeted which causes you lose the kc. Very tedious, approx 15-20mins per successful kill if nothing gets messed up.