I am aware that Vader and Hera are not in the same faction, but let's ask this question early. The way this card reads, it specifically calls out "VPs he would normally gain (rounded down)."
From the official FAQ:
QuoteQ: Does an “Attachment” Skirmish Upgrade card change the deployment cost of the Deployment card to which it is attached?
A: No. e attachment is simply scored simultaneously when the group to which it is attached is defeated. Any e ects that refer
to a group’s deployment cost do not take the cost of an attached Skirmish Upgrade into account.
Which would result with Hater-Vader being: 18 points of Vader, minus the 5 points from Driven by Hatred, becoming 6VPs. (18 - 5) / 2 = 6.5 rounded down.
If the all-wise creators are not cognizant of their wording, cases like this could become: 18 points rounded down (9), minus 5 points rounded down (2) becoming 7VPs. All depending on when the truncation occurs.
QuoteQ: Does an “Attachment” Skirmish Upgrade card change the deployment cost of the Deployment card to which it is attached?
A: No. e attachment is simply scored simultaneously when the group to which it is attached is defeated. Any e ects that refer
to a group’s deployment cost do not take the cost of an attached Skirmish Upgrade into account.
This means that for any trigger that references Hater-Vader before he is defeated, he is valued at 18.
Thoughts?