Editing Warhammer 40,000/8th Edition Tactics/Death Guard (section)

===ZOMBIE HARVEST===
Get a big blob of Poxwalkers and Cultists. Move the Cultists in front of the Poxwalkers, then use Cloud of Flies and The Dead Walk Again stratagems on the Poxwalkers. Now your opponent can only shoot the squishy Cultists, and your Poxwalkers become an even bigger tarpit with every Cultist that dies near them on top of any nearby enemy infantry that get killed by the Poxwalkers or the Cultists. Remember the Cultists don't necessarily have to be DG, so you can use Tide of Traitors for EVEN MORE bodies and increase the size of the Poxwalker blob to utterly ridiculous levels. This basically creates a reverse Distraction Carnifex, something that you literally can't respond to unless you deal with other units first. All smiles motherfucker! Expensive in CP, though. In Matched Play, Poxwalkers that exceed unit starting strength cost reinforcement points now. Bye bye Harvest.

Another option is if you have a "the purge" detachment, tie up an enemy unit with poxwalkers then pop the "Dead walk again" stratagem and follow up with "all life is Worthless" on a havok/obliterator unit to fire into the fight. Any losses from friendly fire should be recuperated with interest right away.