Beasts by the Bridge is a solo mission you can take after the Crocogator mission with Jarvis. It is one of three jobs you can take right after the Crocogator mission, the other two being Smilodon Fang Request and A Masterpiece of Fantasy. Once you pick the request up from Thanos you head for Dorse Region-Adien Region to speak with Elef, Ryan, and Hip. After a cutscene you begin your battle. You will be fighting four Trent and a King Serpent, the serpent will be level 31. Once the battle is completed there will be another short cutscene with the construction group, when that is completed talk to Thanos for your pay.