Talk to the local chief . He will ask you for help with saving the three villages. Start with the nearest. A few RDA unites will wander around . In another one as well. In the last village you will have to fight a mecha. After that, talk to Mendala. It turns out that his beloved Familiam has lost. She is located at the end of an alternative path - you have to go up. Talk to her  and leave until you finish clearing your way back. The first wave should be finished on the bridge. Summon up the girl and leave her just after the bridge. Kill another soldiers and go back for the beauty. As soon as see her off to the camp mechas and soldiers will enter the area. Cope with them. Now, you can talk about crystals. The first one will be behind the western village. In order to get it, first, you must chat with Tsao . Only then he will allow you to climb.
The arena is filled up with RDA units so my advice is to enable a camouflage and quietly steal a valuable item, and then eliminate soldiers. You won't destroy Scorpion so hide behind a rock  and wait until the Pandora Union will be available again. Escape to the village, and then to another crystal in the east. First, you need to meet Naalot in the nearby location. He will send you to Obnilvin . The head of the clan will order you to collect 5 grains of cillaphant in a small area. Cillaphants are those illuminating plants. Then, chief will ask you to assemble the lost hunters. You can find them on the southern path (watch out for the gun!) . After saving the clan, you will meet the whole family going to the cave at the east path. Obnilvin will thank you for the rescue and show you the entrance. Go inside. Kill all RDA soldiers and the mecha and take the crystal . Go out on the other side of the cave and meet with Beyda.
He will ask you to kill a few people from RDA and the mecha (it will appear in the place of the red smoke ). After the battle Beyda will order you to destroy boxes of ammunition. A large number of soldiers are watching for them so be prepared for a quick fight. Set the charges under those four boxes  and flee to a safe area. The last crystal is in the zone controlled by RDA. Go to the cave set with crystals and find the way to the top . Grasp the ore and run .
Bypass the map from the north and meet - in the center - Tan Jala (go across a huge bridge ). Complete the harmony from the willow . Do not worry about the RDA troops. When you set all the crystals  run towards collapsing walls . The last talk with Tan Jala and go to Hometree.
Speak with Thalsik and give him the last but one piece of the song. Meet Tan Jala as well. It will turns out that you will set off to Kxania Taw.