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Kraken

From Wikihack

The kraken, ;, is the most difficult sea monster in NetHack. Like the lesser giant eel and electric eel, it possess the instadeath drowning attack.

Kraken are sometimes a target of reverse genocide, as they are worth a high amount of experience points (even more than the Riders and below only that of some of the demon princes) and only have one hit point outside of water.

[edit] Encyclopedia description

                Out from the water a long sinous tentacle 
                had crawled; it was pale-green and luminous 
                and wet. Its fingered end had a hold of Frodo's
                foot, and was dragging him into the water. 
                Sam on his knees was now slashing at it with 
                a knife. The arm let go of Frodo, and Sam 
                pulled him away, crying out for help. 
                Twenty other arms came rippling out.  The
                dark water boiled, and there was a hideous stench.
                        [ The Fellowship of the Ring, by J.R.R Tolken ]
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