Hellgorak is the last boss of the Inquisition Quest and the one that you need to kill convincing the Dreadbeasts to attack him. As a player can only convince a maximum of 2 creatures, this boss is usually killed in groups of players.
There are some videos in youtube (search: itexo inquisition) that shows that it is perfectly fine to kill the boss with only 2 players, but I wonder if it is possible to kill with just 1 player (solo).
I didn't make the PoI Quest, so I can't access this boss. Have anyone tried this? As there is no time limit to kill this boss and his healing per minute is quite low, it seems to be possible.