Etrigan the Demon With a Green Lantern Ring

Etrigan the Demon With a Green Lantern Ring. (Assume that he has full mastery of the ring).

What tier would you put him in? And who could defeat him? (Characters that most people have basic knowledge of Superman, Thor, The Silver Surfer, ect, ect.....)

Full on HELLASCARY!?

Change! Change, O' form of man! Release the might from fleshy mire! Boil the blood in the heart for fire! Gone! Gone! -- the form of man -- Rise, the Demon Etrigan!! For In brightest day, in blackest night, No evil shall escape my sight Let those who worship evil's might Beware my power... The Demon Etrigan's Green Lantern's light!