The Emperor Ing is the ruler of the Ing
Horde, and also the guardian of Dark Aether's Leviathan
. It is surmised that the Emperor Ing was a Phaz-Ing from Phaaze
that was corrupted and mutated by the Leviathan core, allowing it to rip both itself and the Leviathan into an alternate dimension in order to protect the Leviathan from the Luminoth. The Emperor Ing appears in Metroid Prime 2: Echoes
as a major boss
near the very end of the game, guarding the Ing's final source of dark energy.
The Emperor's first form resembles that of a giant Inglet, and will use its tentacles to try to hit Samus
into the raw Phazon
that surrounds the arena, as well as phasing its tentacles through dark portals in order to stab at Samus directly. Firing at the red core on the ends of the tentacles will cause them to retract, and once all are retracted the Emperor will open up revealing its core. The core will fire a strong laser at Samus to try to stop her from damaging it directly, as well as erecting a shield which will spin around the core. Samus must fire between the gaps in the shield to damage the core, the Annihilator Beam being the most effective but also draining alot of ammo from Samus' reserves. Super Missiles are also very effective. If Samus does not deplete the cores health fast enough, the Emperor will close up and will have to repeat the process of retracting the tentacles again.
Once Samus defeats the core, the Emperor will revert into a chrysalis state, requiring Samus to morph into Spider Ball mode and climb onto the Emperor. The Emperors chrysalis is dotted with yellow holes which tentacles will sprout from to attack Samus. While a yellow hole is bubbling with dark energy, Samus can drop bombs on the hole to damage the tentacle and the Emperor. This phase must be completed quickly as the Emperor generates poison gas that slowly rises and will damage Samus while she is inside the cloud. Inglets also appear that can be destroyed for pickups
Once this form is defeated, the Emperor will hatch, turning into a giant creature resembling a Warrior Ing. Its weak point, its glowing core eye, will change colors during the battle, signifying a change in weakness and attacks. In its orange form, the eye will not attack directly and is susceptible to damage from the Power Beam (and Super Missiles) and the Annihilator Beam. In its purple form, the Emperor will fire a beam of dark energy that will freeze Samus, and can only be hurt by the Light Beam or Annihilator Beam. In its white form, it can only be harmed by the Dark or Annihilator Beams and produces portals of light that fire intense beams of light energy. It can also spawn Nightbarbs, a swarm creature that can be destroyed for health and pickups. After its health is depleted the Emperor Ing will fall, allowing Samus access to the final energy controller.