[quote=@Dead Cruiser]
[@ActRaiserTheReturned] The Flaxans' dimension has a different timestream. One year in was a few hours out. Later, others go for a few months on Earth, and spend over 700 years in their dimension. 
[/quote]

Ah, I didn't know. I only know that he killed the GoTG. 
It should be noted that Merlin's power is probably not enough to take on the GoTG. Omniman, though he took a lot of damage, did quite a bit more than I think Merlin could have.