An Octopus, by the name of Korterpound.
We have a general strategy for killing these horrific beasts.
Locate the "Mind" - Otherwise known as the Head of this monstrosity.
Kill the "Mind"- Killing the mind handicaps all the tentacles, prohibiting them from doing much until..
The "Mind" selects a new host Tentacle. - Kill the new host.
TL:DR? : Slowly reduce the monstrosity from 1 pound, to 0.75 pounds, to 0.50 pounds to 0.25 pounds, until nothing remains.