Necros don't need groups, that's the golden rule.
If you want to be out in the open, get to 23ish and go to OOT - camp the dwarf "couple" on the sister island, then move onto the other named sisters starting with Antinime near the docks.
Gargoyles on a separate island are a possibility and don't forget to look up the Harvester quest, there's a mob in OOT as part of it
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