Havoc
Another Piece of the Puzzle
So I guess the question is then what exactly is this force. The easiest way is to use the corrupted grail to create something particularly nasty or maybe someone has figured out how to 'hack' the grail to grant their wishes freely, thus giving continued threats to the groups until they're dealt with. But it's late so I've gotta crash for work. I'll give it some thought while there and see if I can come up with anything if ya'll haven't by the time I'm off.