saving cass/Killing the van graff

[DancingDeviljho]

soo i was doing the whole cass and the van graff mission but i didn't wanted to cass to die soo when i talked with "Mr.♥♥♥♥♥♥♥♥♥♥♥name" and he told me the hole thing i just blow the ♥♥♥♥ out of them...... killing the van graff affect game in any way? missions, ending?

[MannsOverMeta]

Killing the Van Grafs means that you can't do the peaceful option of Cass's companion mission.
The ending, if you go with Cass's quest, will be that the NCR are pressured by the Mojave branches of the Van Graffs and the Crimson Caravan.

[OutsidR]

Kill them and grab what you can .. good stuff too. Cass will then go on her way to Mah. Outpost

[Akasaki]

It not effect game's ending that much. But even you choose to settle this with ncr's law, the vangraff guy still try to attack you in freeside tho.

Cass will gain different buff depend on the choices you made.