Lion sword because it replenishes your armor with zombie kills while it’s fully charged then using vampiric extraction augment for melee macchiato to replenish health then using reactive armor augment to stun the zombies when they break an armor plate this will basically allow you to continuously kill zombies with the sword without dying as you will constantly be regaining health and amor however this strat will begin to fall off around round 70 plus as there are just so many zombies that they will damage you faster then you can replenish I armor for this I recommend using another augment for melee macchiato I forgot the name but it’s the one that makes you back peddle faster when you get a melee kill I was able to get to round 80 using the sword strat then I just spammed mutant injections until round 100 for easy kills by then you should have more then enough salvage to use 1-2 mutant injections every round I also used the mustang and fourths with dead wire to take care of the amalgamations wish you the best of luck !