The nightfall is Valus T Haric and there is no burn modifier... I'm not sure if that is good or bad I well be cheesing the tank and Valus tonight if anyone joins me. Here is how I play it: ~I run through the 1st room because you respawn even in Nightfall. ~Kill the 3 Cabal majors with shields using IB ~Go get a tank when the tank comes and here is where my cheese comes in; if you position your tank on the right side of the pillar with the enemy tank on left you can shoot him using the splash damage from your right turret while the left hits the pillar. Does it take long? Yes! Does it guarantee you die in a nightfall? Hell ya it does. ~I usually try to blow by the next set into the compound and do the usual cheese with Valus.