Build Guide
Essentially use strafe with cold rune to enable iceblink to provide additional crit chance for your allies while also enabling efficacious toxin to give damage boost and damage reduction.
Use Calamity to automatically apply Mark for death and use Death's Toll rune to provide healing to your allies, while also extending the duration from custom engineering and also providing additional sentries along with bombadier's rucksack to have multiple guardian turrets to give allies 25% damage reduction.
Between Wolf Companion and the base effect of Mark for death allies will also get 30% additional damage.
Frost burn gauntlets are good for added freeze although another passive such as Leoric's Crown could be used instead.
Chain gang rune is nice as it hits more enemies spreading both mark for death and the buff for Odyssey's End. Visage of Gunes provides us damage reduction as we want to try to stay alive to support our allies, Wraps of Clarity helps with this as well. Cold rune on Vengance is a further way of enabling Ice Blink and freeze however Seethe is another option for hatred if it becomes a problem.
You want CDR and RCR this is most important. This isn't a damage build so we don't need Crit at all.
Also Note* the 3 missing pieces are for the new Gears of Dreadland set. It will provide Momentum stacks to give us movement speed to keep up with the party and automatically shoot our spender to help us as well as give us damage reduction.
Hey mate nice guide. If u want my 5 cents, I've would have swapped marked for death ability with multishot with frost rune. Tou can still buff with mark if you are using Calamity and on top of that i gain the 8% crit buff (if i remember correctly) buff from multishots frost rune. Then you can also keep ligtning rune on strafe so you're not losing hatred so fast.