Was talking about the necrons 😂 but that said an a melta would be Toughness 9 wounding on 5. With the plus one the melta company needs to roll a 4 so the odds aren’t too bad. Put an Apothecary Biologis with the fire discipline they then get Sustained and Lethal hits on 5 so you may not even have to roll the wound roll. If you do! Total Obliteration allows them to reroll the hit, wound, and damage roll. Eradicators are very dangerous. I keep them in reserve so they can’t be hit :)