Stephen King's The Dark Tower: Roland Deschain and the Lobstrosities.

The Dark Tower II. The Drawing of the Three.
Prologue.

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There was a half-moon in the sky. A caul of mist covered it, but it shed enough light for him to see that the holsters were too dark. The guns, at least, had suffered a wetting. It was impossible to tell how bad it had been, or if either the shells currently in the cylinders or those in the crossed gunbelts had also been wetted. Before checking, he had to get away from the water. Had to—

"Dod-a-chock?" This was much closer. In his worry over the water he had forgotten the creature the water had cast up. He looked around and saw it was now only four feet away. Its claws were buried in the stone- and shell-littered sand of the shingle, pulling its body along. It lifted its meaty, serrated body, making it momentarily resemble a scorpion, but Roland could see no stinger at the end of its body.

Another grinding roar, this one much louder. The creature immediately stopped and raised its claws into its own peculiar version of the Honor Stance again.

This wave was bigger. Roland began to drag himself up the slope of the strand again, and when he put out his hands, the clawed creature moved with a speed of which its previous movements had not even hinted.

The gunslinger felt a bright flare of pain in his right hand, but there was no time to think about that now. He pushed with the heels of his soggy boots, clawed with his hands, and managed to get away from the wave.

"Did-a-chick?" the monstrosity enquired in its plaintive Won't you help me? Can't you see I am desperate? voice, and Roland saw the stumps of the first and second fingers on his right hand disappearing into the creature's jagged beak. It lunged again and Roland lifted his dripping right hand just in time to save his remaining two fingers.

"Dum-a-chum? Dad-a-cham?"

The gunslinger staggered to his feet. The thing tore open his dripping jeans, tore through a boot whose old leather was soft but as tough as iron, and took a chunk of meat from Roland's lower calf.