The term 'well-armed creatures' can be summarized by the crossword solution of octopi, which are eight-armed sea creatures. Octopi are cephalopods, a group of mollusks that also includes squid and cuttlefish. They are known for their intelligence and ability to solve puzzles, as well as their remarkable camouflage abilities. Octopi have two rows of suckers on each arm, which they use to catch prey and manipulate objects. They also have ink sacs that they can use to escape predators.