This is probably too late (not sure why nobody responded) but anyway I will try to offer a few tips.
The L6 is a Zombie, Zombies have more hitpoints than the average so they aren't optimal targets but you can still attempt to kill it. You should kill the L1 Zombie to free up access to tiles in the middle for "Regen Fighting".
What this means is you hit the target (L6 Zombie) until you can't take any more damage, cast Burndayraz on it 1 or 2 times depending on your mana. When enemy has a burn stack on it, it will "regen 1 less health per tile" so instead of 6 HP, it will regen only 5 HP per tile which is the same as you.
After this, you explore more tiles until you can hit or kill it. If you can't kill it, just explore until you have enough mana for casting Burndayraz once and repeat the process, i.e. hit it, cast Burndayraz, regen, etc.
If you can line it up against a monster, you can also use Pisorf to deal damage to it.
Humans also get +10% Attack bonus per 100 conversion points so you can convert glyphs if you aren't using them, like for example Imawal. Bysseps give you +30% damage for 2 mana and you can pick it up and use it, helps with regen fighting too.
Hope this helps,
