probably before even starting treasure quest you need to increase likes with all of them. Increase likes with Roushk up to 40 by having private trainings with him. Same goes to Rhot, increase his likes over 40. With Priestess you need to increase likes during first quest by doing best pure options, so she'll like you more. Also sparr with Grushk for 15 likes or so.
Total likes of these guys will lead you to the best ending of the second quest "Lizards' treasure" (if you did good choices of course) and then enjoy the feast