the spider thingies you just kill with your staff of scaris. They'll die. If they poison you carry cure poison potions which you can buy at the from the woman in the area of the temple (she has a store I think its called an apothecary).
The tomb mummies....well it depends what you consider cheating. I consider enemies that can freeze me at level 7 a little unfair. You can pause the game and status effects wear off while the game is paused. There are numerous enemies who can spam status effects and I think the game would be very hard to beat if you didn't use pause.
Otherwise I think hit and run with high vitality (in case you get frozen and slashed up) and high dexterity (so you always hit and knock them back).
Generally the way I play is to use the troll xp to raise intelligence quite high early on but if you spent all that xp in other abilities you might stand a chance without pause. You could also raise honor and bargain high enough that you can buy and sell back for a profit. Then just fireball everyone with 1000 books of fireball
I wouldn't do that I tried to find a happy medium between too much cheese and just enough to make the game playable.