When I get occulus I usually just zerg through and kill the first boss then afk the last 5-10 mins till I can get a new dungeon. That lowers the odds of getting oculus again as you are already saved there. I can also down the first HoR boss but I dont usually bother as I dont need anything from him now. I will kill those last 2 HoR bosses at some time over Christmas though just to say ive done it.