During the third and fourth season, it is revealed that only a certain faction from the future wants to see history changed.

They also add special extras to certain factions according to the advanced rules.

He'd come along on the mission because it was a convenient way to get off Earth, away from certain deadly factions.

It was known that he ruled certain factions in the underworld; yet nothing had been definitely pinned upon him.

But stranger things had happened in the U.s. intelligence service, and he wouldn't put anything past certain factions, nothing.

A shame then that certain factions keep on banning this representation.

These are necessary to gain points with certain factions.

There is a certain faction within the army that is working against the government.

But now, a hundred years on, certain factions persist in taking it at face value.

"You don't think certain factions in Russia might be a little angry at you for pulling out of their deal?"