You´ll definitely need a party. I think I heard of one or two people taking Nossirom down single-handedly but I certainly needed a whole party. Rest assured though, when it comes time to take on the Shadowjumper you´ll really need a few other guys. He summons like crazy and just hacking your way through all of his minions is enough to get you killed over and over and over again.
Nossirom in LoA (could be considered a spoiler)
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It´s possible to complete DS with a single character, but I think that LOA can only be completed with a party, or by summoning powerful allies via spells.
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arg, that just ruins everything, i was so proud i got this far... especially cus my character is level 31 melee, 27 ranged and 5 nature(healing and strength spells...) the thing that bugs me is most of both DS games is that most of the game is easily beaten with just a single character.... so why dont they make the rest of the game more challenging? blah, oh well.... at level 5 spellcasting i doubt ill be able to summon anything all that powerful.... =P