You can try to stick close to the portal that leads back to the previous level. Kill one, retreat, heal, rinse, reapeat. Summoning stuff is also nice but that battle is hard and you are really at a very low level. If you succeed let me know and you'll be immortalized, at least by me, but hey, that's something right.
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JR
Damned i lost cousin Jan's techno gloves
Forest runner and first gnomish demiranger-protector with slightly rougueish tendencies and a natural dislike for Aerie