Phantoon is a boss from Super Metroid and Metroid: Other M
Phantoon is a usually transparent spirit, first appearing on the wrecked ship found on planet Zebes, his eye is only vulnerable while he is fully opaque. Other times he floats around, dropping balls of blue fire with somewhat noticeable eyes within.
When Phantoon returns to fight Samus, it is far larger. Its fire homes in on her like heat-seeking missiles, vortexes summoning pillars of fire and arms. And Samus'sb target remains the central eye, but it also has extending eyes she must worry about. After taking enough damage, Phantoon explodes in the vaciuum of space.