GoD/Marauder Support Demon Hunter Skills and Runes

Active Skills
Bolas Freezing Strike Strafe Drifting Shadow 1 Multishot Wind Chill 2 Smoke Screen Displacement 3 Companion Wolf Companion 4 Entangling Shot Heavy Burden
Passive Skills
Awareness Blood Vengeance Tactical Advantage Numbing Traps

The playstyle of this build is fairly straightforward, but requires a decent amount of attention and precision to execute. You will be spamming both Smoke Screen (for your own safety and movement speed buffs) and Companion (for the myriad of buffs from your summons) throughout the rift. Begin the run with a shot of Bolas to "load it" into the GoD 4-piece bonus, and start to Strafe — this way you will gather everything in your wake, creating nice clusters of enemies for your DPS teammates. When you run into an elite, pause your Strafe and prepare them with a shot of Multishot Wind Chill for the crit buff; then, fire off an Entangling Shot to load that into the GoD 4-piece, and Strafe around with it to spread the damage bonus. As your teammates finish off the pack, fire off a Bolas again and move on with Strafe.

Unlike many DPS-oriented builds, Multishot will be taken strictly for the Critical Hit Chance buff from the rune Wind Chill, which you will apply on Elites and any major fights prior to your DPS teammates engaging them. Note that this will also apply the valuable damage debuff from Numbing Traps.

While this is a Support build and your gear rolls will make you naturally very tanky, Smoke Screen is still an invaluable safety tool, which will double up as a movement speed boost from the rune Displacement. If you are doing a non-pull version of the build (you are running with another pulling support) you will be losing the Bolas trigger of Strongarm Bracers, so this slot should be replaced by Vault Rattling Roll to gain another proc for said bracers. In any case, this dedicated "movement skill" slot will also be the one that nets you the benefits of the Tactical Advantage passive.

For the sake of example, we have taken Companion with arguably its most important rune — the damage multiplication from the Wolf Companion. Note however that this build incorporates 2 pieces of the Marauder set, which automatically net you all companions at your side — the other notable bonus being the toughness boost from the Boar Companion.

Entangling Shot is the major reason DH Support is a viable option in the first place, due to the massive damage increase to the entire group against enemies affected by the entanglement via the Odyssey's End. You will be taking the rune Heavy Burden for the additional slow duration, adding stronger crowd control component to the skill.

Bolas is the other major reason DH Supports work; they gain a substantial pull (both in terms of range and effect) from the Leonine Bow of Hashir. You will complement your support utility either by taking the rune Freezing Strike for the added safety for your team, or Bitter Pill for your own convenience in Discipline management. If you are doing a version of the build without pulls, this slot should be altered to Marked for Death Contagion.

Strafe is a central mechanic to any GoD-based builds, as it spreads the signature barrage of primary skills they are known for. It also doubles up nicely as a movement skill and allows you to ignore enemy collision, all without hindering your movement speed due to the rune Drifting Shadow.

While support builds are naturally tanky, it is still recommended that you take Awareness for its cheat death proc to avoid any misfortunes during the run, and slowing your group down.

Tactical Advantage offers a nice speed boost whenever you pop Smoke Screen or Vault, which is useful in keeping you ahead of the group (where you should be, preparing fights for the coming onslaught of your DPS teammates).

Blood Vengeance will not only expand your Hatred pool, but also enables a Reaper's Wraps-like effect that replenishes both Hatred and Discipline when picking up health globes.

Numbing Traps will reduce the damage potential of enemies by a quarter pretty much constantly due to your various Slow and Chilling effects ( Entangling Shot, Iceblink...) going off at all times.

A good option for a fifth passive if you use a Hellfire Amulet of Dexterity as your amulet is Hot Pursuit for the additional movement speed.