Wyvern Tears

From Monster Hunter Wiki

Wyvern Tears are dropped by certain species of wyverns when the are struck by surprise, such as when a hunter tosses a sonic bomb at an oblivious Kut-Ku. The Item is an account item so you dont get to keep it. At the end of a quest each wyvern tear in your inventory will be exchanged for 500 Pokke Points, which means they will be removed from your possession.