Can someone help me with the Winning of AQ pets?

In the rule book there's no section of campaign finale like in AQ or Inferno.

my question is

Does every guild wins when you kill Vexia?
or
is it like normal AQ Or Inferno: the ona who gives the final hit to Lord Fang/Underlord?

and do the medals count any kind of final type of winning like in AQ (the amount of medals) or share the "victory" like in a Inferno (savior of Arcadia , ultimate Arcadian)

thanks for the replies Heores