Stuck in Act 2 - help needed

I'm currently in Act 2 and have two quests open:

1) "The Trail of Corruption: Retrace the legendary Orbala's path to recreate the Horn of the Vastiri"

=> The quest marker points to the Ardura Caravan, but there is nothing to advance the quest. I already exhausted all dialog option with all NPCs.

2) "A Crown of Stone: Enter the Titan Grotto at the Clasped Entry"

=> The last thing I did was clearing the Valley of the Titans, activating the 3 runes there and then inserting the two relics, which lets me select "30% increased Charm Charges gained" or "15% increased Mana Recovery from Flasks". I assume the entrance to the Titan Grotto should be somewhere on this map, but I can't find it.

I don't have any clue what I have to do at this point to advance the story. I assume I encountered a quest bug.

edit:
I restarted the game and decided to check the whole map again and the Titan Grotto entrance appeared at the other end of the map. This should have some kind of quest marker.

You probably bumped on a rock that looks like a dead tree and when you get close the camera zoom out, that's the entrance after the seals are undone.

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Nirimetus#4574 wrote:

You probably bumped on a rock that looks like a dead tree and when you get close the camera zoom out, that's the entrance after the seals are undone.

Yes found it as I checked the whole map again after a game restart. This location should get a quest marker or a better description where you have to go. Lets see if this leads also to a solution for the other quest.

It's a complete grind, this mission... going up and down feels like a never-ending spiral. I’d rather play another game.