Severus | Regulus
The one I thought was going to fail, did. Fortunately it decided to dissolve rather than explode. My workroom thanks you for whatever error that was. Of the others, two of them would definitely poison him if you would care to give them to him. But the last one looks very promising.
That would be fine. You can help me scare off the self-style 'witch' who has taken to lingering and trying to tell me about her crystal scrying.