Thanks to this part of the Guide Monster Hunter Stories 2, you will be able to discover all the elements relating to the main quest "Beyond the overhang". Here you will find the complete path of the mission as well as information on the bosses encountered.
Talk to Kayna near the quest panel then leave the village. Then join the marker and ride Ranmar so that you can climb the rocky peak that will lead you to the Aptonoth lair (pictures1-2-3).
Now cross the lair and attack the Velocidrome waiting for you in the last room (picture4). To defeat this creature, opt for “technical” type attacks to counter its speed (picture5). At the end of the confrontation, collect an egg and then return to Chief Gara to complete the mission (picture6).