“Stop the Risen attackers from reaching Brigid’s Overlook” event has an NPC that will give you seed mortars to help set up the line of defense. When placing one of the seed mortars it put me below the land (which caused my surroundings to look like water). I could not get above the surface and had to waypoint.
It’s a kitten conspiracy. Kittens gonna be kittens. All is vain!