The side quest A Letter From an Unknown Sender in Monster Hunter Stories 3 Twisted Reflection is one of the first side stories for Ogden. However, before you begin this one you will want to make sure that you’ve completed Amara’s Child first
How to Complete A Letter From an Unknown Sender in Monster Hunter Stories 3 Twisted Reflection

While at the Ranger Mess, talk with Ogden. There will be a cutscene and he will show you the letter he received which has information on an Exotic Velocidrome. The next step is to head to the yellow exclamation point that is on the map.
Going to the Egg Quartz

Once you head to the exclamation point on the map with Ogden, you need to find the egg quartz. There will be a cutscene which leads to the Exotic Velocridrome showing up, which is the monstie you are looking for.
You just need to wait to put yourself in the path of the monstie. It’s pretty fast so you won’t be able to catch it. At least it runs up and down the same path so you’ll know exactly where to find it.
Fighting the Velocidrome – Shock Trap and Tranq Trap Recipes

The fight is a little tricky because the monstie is very fast. Using normal attacks or skills isn’t going to do anything. If you want to land a hit on the monstie, you need to use double attacks or kinship skills. This will be the only way you can attack the monstie and keep up with it
To trigger a double attack you need to win a head to head while attacking the same opponent as your monstie. The attack must be the same between you and your monstie. Do not use a skill that has no attack type because it can’t trigger a double attack.
Once you defeat the monster, there will be a final cutscene. The reward for finishing An Unknown Sender in Monster Hunter Stories 3 Twisted Reflection is a shock trap recipe, and the tranq trap recipe.
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