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Based on comments looked for a cave nearby found one with ogres but no shadelings so flew around and found 2 opening near the raid and found a few. Look for cellar openings at 48.24, 78.31.
update: found a spawn of 6 or more in one cellar but then after an hour no more had spawned so I was pretty aggravated with blizzard. Finally 2 more spawned and the elusive rare was the last one I battled and I got him! woot