I've been up to Atheon. Most of the trouble there came from the group I was with being obsessed with pushing him off post patch. We defended confluxes a man down. A void Deviant Gravity with field scout helped. I'm not saying I didn't have trouble or it was a perfect run, but I held my own for the most part. Granted, at this point with new legendary gear coming it makes me wonder if there's a point to trying for it at all anymore besides getting the Mythoclast for the collection.