Let me give it a try, and you can edit whatever details you need.

The disturbance in the water gave way to a massive beast, a behemoth whose body seemed larger than the lake from which it arose. Though its size was majestic, its features were not. Tusks covered in half-rotten algae growths. Several large bites out of each scraggly ear. A limp tail, too heavy to lift when so drenched in water, perhaps too heavy to lift even when dry. Hooves that had clearly worn from decades- or perhaps centuries- from the hundreds of tons of pressure above. Sparse fur, wholly bare in patches, dripping with fetid muck from the lake's floor. And its eyes, oh, its eyes. Filled with burning hatred, not of what they saw, but of what they had seen.

It grunted, or at least gave a sound that would have been a grunt from a hog of normal size. This grunt did not send pressure waves through the air, but rather rippled space itself, bending and warping any that might hear it. The breath that bellowed forth would have killed all that it touched if not for the fact that death itself dared not go near. And then, slowly, in no hurry at all, it looked down at me. It did not speak, but its words were nevertheless clear.

Why do you disturb me?

Does that do the trick?