On the left side of the New Camp, facing the cave wall, you'll see a group of people standing around a pot. One of them is Baal Kagan.
Talk to Baal Kagan and ask about swampweed distribution. Although he'll tell you that you can't help distribute the weed, formally, he would be interested if you could help seed for customers amongst the New Camp. Agree and he'll give you ten pieces of swampweed to hand out to different Rogues of the New Camp for 10 ore apiece. After handing out the swampweed, return to Baal Kagan for your reward.
If you ask for money, he'll give you that. It's not a great choice though.
If you ask for magic, you'll get to pick three spell scrolls from Charm, Fist of Wind, Pyrokinesis, Sleep and Telekinesis.
- Sleep can be used on one of the pupils of Baal Cadar which will also allow you to trade with him. You'll also get a sleep spell scroll for completing the Swampweed Harvest, but that quest is much harder.
- Pyrokinesis could be used to take out one powerful character provided you have enough mana.
- Fist of Wind can be bought from Baal Cadar so you probably shouldn't get that.
- Charm and Telekinesis will be sold by Baal Cadar starting chapter 2.
If you ask for his vote into the Sect Camp, he'll give you some Prepared Swampweed. During the Baal missions, you give the Prepared Swampweed to Baal Tyon.
Try to perform Baal Kagan's quest and Baal Isidro's quests separately. You run the risk of selling or handing out the others' swampweed by accident.