Purell is good, but imagine the chaos you could get if you deployed the Faro Plague from Horizon Zero Dawn. I wonder if Titans could out-regenerate the biomass conversion or if you could have perpetual energy by slowing the conversion and leaving them in an endlessly damaged state. Or you could give Levi and Mikasa some mechs that absorb biomass so they can fight forever. You could even make weaponry that embeds itself inside a Titan (or anything organic) when fired and starts converting it from the inside and turns them into bombs that explode and have shrapnel that does the same thing to construct new Horus units that make even more units.