You have less than 24 hours to beat the Weekly Nightfall mission in Destiny until it resets. Nightfall missions are at this point the toughest challenges since all enemies and bosses have increased health and damage numbers, as well as the added difficulty of having to restart the whole mission over if you all fall, since you get ejected back into orbit.
If you've tried your hand at it and you're finding the Devil Walker to be extremely tough, take a look at CrossCoastGaming's video which shows an in-depth guide to surviving the boss' heavy weaponry, as well as safe spots on the map to continually do damage.
It comes down to setting up in one of three spots on the map, which are shown in the video. Two of those spots will be reserved for continuous damage, while the third will make sure to revive any fallen members as his primary goal.
Take a look at the strategy video below, and good luck!
