I rescued Halsin, he helped me killing the goblin's leaders,than we return to the grove, he told me to speak with Rath and colect my reward, so did i, than he told me to talk with him in the morning and enjoy the celebration, did that too, in the morning he was at he camp and i can chat with him, he tells about the Underdark, but the quest "Rescue Druid Halsin" isnt finished, and im sticked, cant go further, already fou the ornamented door that leads to the underdark bud its locked and its impossible to picklock, can sobody help me pleas?
Sorry for the grammar mistakes btw, english isn't my first language.
You have four paths to the Underdark:
1. Goblin Camp
2. Zentarim Shelter
3. hole in the well
4. Hag's Teapot house
The door you're talking about is probably in the goblin camp? There you need to solve the puzzle on the floor. Also, I don't think you can continue Halsin's quest in the first act, which is available in EA. But you can get into the Underdark.