Disclaimer: I don't own Harry Potter, and my bank account can agree with me. Any OC's are MINE! Ps: Hagrid can do magic in this!
During GOF. Night before the Second Task
The merpeople were in pain. When they had been visited by a pale, dark haired creature in their lake the night before the second task and offered a deal, they had, of course, been sceptical. But when the pale creature had offered to span wards to Block Magic round their village, they had rushed to provide anything he needed.
So the dark magic that made them so angry and volatile was banished back to its creator and no merpeople had to die during the task, (by accident or on purpose).For his 2 services to the ruling merpeople the stranger was offered 2 gifts. Anything he wanted would be given.
So the stranger asked for a trident that could channel his magic, he also asked for a bride.
So the Princess Evea Lovegood Heir to the throne of the sea was wed to the stranger that very night.
So all was peaceful until the stranger gave his name to his wife before he returned to the surface "Harry Potter, at your service ma'am"
Day of the second task
"So you're saying that another grand prophecy has been made?"
"Yes Hagrid, I have just spoken a prophecy, thank magic that I was speaking with Mr Longbottom about him dropping my class, or I never would have known."
"So what does it say?"
"Unfortunately Mr Longbottom decided to stutter the words out, he was a wreck; all I got was something about peace between the sea and the land. And a name."
"Well who is it then?"
"Harry Potter will bring peace to land and sea"
(Please don't kill for cliffhangers! I will probably update weekly.)