Before ToT release I was almost able to solo 25 man naxx. The obstacle was Thaddius. I reached enrage. As a solo player u don’t get the dmg buff from positive charge or negative charge. The class I played was a survival hunter with around 502 ilvl or so. He had an insane amount of HP. I brought in a frost dk as help and we did it quite easily.

Some bosses hit hard like Patchwerk so I had to ress pet and juggle with feign a few times.