Bloodstone Caves chest?

I completed this dungeon twice already and when I kill the final boss it goes to a cutscene therefore I can't open a chest... and Guildwiki states there is one.

Your doing the mission not the quest for the area, you need to find a quest or just go in if you can without the mission.

All dungeons in EotN have a special quest associated with them. YOu need to get that quest and enter the dungeon in normal mode, not in the storyline mode/mission mode.

OK I found out that the special non-storyline quest is The Arrow's Point. So I head out into Sparkfly Swamp and get to the Bloodstone Caves. As far as I know, the door is closed and the only way to get in is talking to the Inscription Stone. That activates a cutscene and when you get inside it says "Quest Added: _____________" and makes me do the primary one.

Don't talk to the circle with an !. Walk INTO the door, it's not really there. It'll open as you walk through into the portal.