mp eater and monster mp

Some odd stuff I found..

1) Yes it can only be activated once per attack, regardless of mobs hit >.<
2) However the activate rate does stack
3) It only absorbs half of what the description says, this at least apply to jr newtie(200mp) and skele(240mp). I only absorbs 40mp per activation from jr newtie and 48mp from skele instead of 80 and 96.