The Abyssal are obtaining reinforcements from the Plane of Water by way of several planar tears hidden beneath the seas and lakes of Telara.
Use this Warped Coral Focus. It will allow you to lure the creature on the other side of the tear into Telara.
These creatures are responsible for maintaining the tears. By slaying them, you'll help to slow their buildup of forces.
Your actions have definitely set back the Abyssal's plans! The Runeguard thanks you for your service, [%NAME].