I made whole arc in three goes with lvl 20-21 mage. I used wand-lightning-desintegrate combo with max barrier and armor. I also had lesser summoning that destroyed all wizards and droids. For eq it was shock wand. (Latter tesla) Lightning orb, weird hood/hermit hood, caretaker's tunic, sandals of the witches, minotaur king cloak, amulet of whispers, bishops ring, ring of unlife, mad wizards pants, automatic gloves and mana belt. If you'll max wands and get tesla you'll kill single steel spider witout taking any damage. Lesser summoning works great for wizards. Get a lot of potions and don't use desintegrate aside from first attack. Use zig-zag technique if you don't have summoning.(lightning -> dodge attacks -> lightning -> repeat) If you'll get good at this you'll make it without any damage taken. This tehnique works great with spells and potions vs any ranged boss or enemy. With strange hood damage from radiation will be meaningless as lomg as you'll avoid corridors as much as you can and go straight to reactor or belt. Summoner is almost useless in reactor and ashen areas. Radiation is simply to strong. Sorry for any mistakes.