The gulper eel is the first fight you’ll encounter in Silt. Here’s how to defeat it. Once you trigger the fight you’ll see an arrow-shaped rock above. Bait the eel to bite and crush it to open the area above. Head up and possess the angler fish, and take the tunnel on the left. Break the thread to cause the rock to fall, and bait the eel to bite the rock. Head down and you’ll find a diver. Possess the hammerhead shark and return to where the angler fish are located. Break the rock there and bait the eel to bite it once again. Now drain the eel while its down.