Dark Echo

From Wikitroid, the Metroid wiki

A Dark Echo is a copy of Dark Samus formed from phazon energy. They possess a simple phazon-based copy of the Power Beam and a far smaller supply of health than Dark Samus, and thus can be destroyed by a few shots. They exist only as decoys to distract Samus as Dark Samus drains Phaaze's energy in the final battle between the two, and to that effect, they can create the illusion of draining energy as well.

[edit] Trivia

• They are presumably named after Metroid Prime 2: Echoes for obvious reasons. It is interesting to note that the Japanese version of Metroid Prime 2 is called "Dark Echoes".