When Orcus gets power from portals it becoming very hardcore and it;s buff not removes after timer ends or portals get closed and even after party was wiped!! So if you trying restart to fight him you'll getting around 700k damage on few first hits.
There is ACT's screen of outgoing damage from Orcus (already after first wipe). Sorry I mostly playing on RU server and some words are сyrillic but look on numbers please. http://s23.postimg.org/bcn0f5lgr/2016_03_21_21_48_58.png
I can add video but my DC doesn't getting damage often and you will not seen red numbers so often.
Yea, so I had (I think) a similar issue. The portals came up and Orcus got his massive 90% damage resist, but it never went away! We went into the portals and killed the mobs and came out and Orcus still took almost no damage. How do I know this? ACT shows my attacks being made useless for the last 10 minutes of relentless pounding:
As you can see from the first line for example, the 135k ice knife does 27k : / + : ( + >: /
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As you can see from the first line for example, the 135k ice knife does 27k : / + : ( + >: /