I suggest that Inferno Sword should be sharpness 6 or sharpness 7 due to the fact that the area is a pvp , high level area it suck that a custom item that is also high level to be trashier than a vanilla sword .
The inferno sword is bad compared to other swords but a really good thing about it is the perm fire aspect which wont go out without extinguish or warping out
