at what level can i kill Uzair?

I'm inside the tomb of marshland of xen.my characters are at this level-
Random-22
sarah-21
guanidia-22
barreta-20
i cant finish off Uzair and all my healing potions have depleted
.what level do i need to beat this creture?
and which is the best place to level up?
the sad part is that i dont have any potion or something that can revive my characters during fights.that is making my chances of winning to almost zero.
Random-22
sarah-21
guanidia-22
barreta-20
i cant finish off Uzair and all my healing potions have depleted


the sad part is that i dont have any potion or something that can revive my characters during fights.that is making my chances of winning to almost zero.