"Yes, I think he could. There is no match for it.. I've done some research on fiendfyre in the past but any information is exceedingly rare to come by - it's incredibly destructive. The ministry outlawed its use in 1939 after a particularly scorned wizard used it to light his lover's house a light - destroying an entire village. In the end they had to remove all the oxygen from the area to distinguish it - killing everyone within the barrier. I wouldn't even know how to find the incantation - I imagine it's been purged from all records."