We've done it with 17 (I missed that one). But I've seen an 18 man one. Had 4 people on pets so only 14 on odin.
2 aegis plds. A few rngs and smns, 2 sams, rest mages.
Won easily with a few minutes left. Only thing that was kind of scary was Geirrithor since 10000/14 is still quite a bit of dmg.
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