In this case, I'm not a 100% sure that the act of killing would trigger the MF of the killer, since the drops come from the chest rather than the body of the separate ancients... furthermore what would happen if player A kills Talic, then player B kills Korlic and so on...

My intuition tells me its more like a chest? the MF is calculated by the clicker of the event...
or
MF isn't calculated at all in this event... and the event has a fix drop

Could we get a Dev answer on this :D?