No, you just need someone else that has done it as you need to open the portal for the boss fight.
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Just to check, you weren't trying to checkpoint it from the final boss right? all of your runs were ~5-6 minutes in length. You have to do the dungeon from the start: - Kill the first boss - Do the torches/blights in the jail area - Do the torches/blights at the broken bridge where the Blighted Chimera spawns - Kill the second boss - Do the torches/blights during the jump puzzle just before the final boss area - Enter the portal - Kill the portal area boss You can't skip over any of the steps or use a later checkpoint.