If you're level four, you shouldn't have too much trouble tackling the undead outside of town. Especially in the vicinity of the archeologist quest, those are the weakest.
What kind of party are you using ? Some character archetypes have been noticed to be less "optimized" than others...
If you use archers and air or water spells to control the mobs of undead, or fire to do a lot of area damage, it shouldn't be too hard. Summons (wolves) are also good to soak some damages and get flanking bonuses going. A healer is always a must.
Something like wayfarer/warrior/wizard or cleric/ranger/caster should do well. Party of 2 with lone wolf traits are also quite overpowered. Ranger+Cleric and you're set. The comeback kid talent might also help against unlucky rolls...
This guy, for instance, takes on the orcs at the beach at level 2 with a warrior + witch(not necessarily the most optimized combo), so it's not that hard (though the ennemy caster's AI seems a little more awake with the latest update...)
:
www.youtube.com/watch?v=IAUU5GLwemg&list=UUdbL-i29FDPYok8X8yIynNQ