Most of the actions that we do in ROSHAMUUL usually give points that we can exchange for cluster of solace, as it is not necessary to ask for the missions and even each monster killed gives you 1 point, many players have thousands of accumulated points. Every 100 points are equal to 1 cluster of solace. If you have 1000 points you can exchange them for 10 cluster.
Follow the map and talk with Sandomo:
Be careful to have enough capacity so as not to lose your clusters.