shadowdabest
Homebrew (Unpublished)
Lord felthius and his tainted cohort + a plague marine champion
Army Rule "The Living Plague"
Every friendly operative emits a 3" Contagion Aura. If an enemy operative ends its activation within this aura, it suffers 1 Mortal Wound as the infection takes hold. Additionally, if a friendly operative kills an enemy, that enemy model is removed, and any other enemy operative within 3" of the spot where they died must roll a D6. On a 4+, they also suffer 1 Mortal Wound.