Merion told you that children of the village are forbidden from venturing into the Wadewater... which makes it very likely to have been Tegwyn's destination.
'You should follow the road north-east to the Dunlending town of Lhan Garan. It sits on the eastern side of the Wadewater, and their scouts may have seen the boy. Perhaps he went to speak with the Dunlending villagers there, and is even now enjoying their hospitality or their tales? We should not leap to judgement too soon; he may be in no danger at all.'1/1
1 Enter areaVisit Lhan Garan on the eastern edge of the Wadewater and learn if there was any sign of Tegwyn1/1
2 Speak toMeneldir (Show dialog)
'I heard Tegwyn has gone missing, Player. With Uruks in Swanfleet, I felt it wisest to begin the search as soon as possible.
'That said, if he has truly made for the Wadewater, I think Uruks may be the least of his problems. The footing there is unsteady, and like any marshland the depth of the pools may be deceptive. There are creatures in the Wadewater that would love nothing more than to make a supper of anyone who strays too near their domain. The most dangerous of these are the avanc, and we should hunt them as we seek the boy.'1/1
3 KillAvanc in the Wadewater (x/6)6/6
4 Speak toMeneldir (Show dialog)
'No sign of Tegwyn? I have seen nothing either. I was trained in the art of tracking, but this marshland has put my skills to the test.
'Let us listen for some sound of the boy. We must use all of our senses on this hunt.'1/1
5 Emote/listen1/1
6 Speak toMeneldir (Show dialog)
'Nothing.
'Let us continue our search further to the west.'1/1
7 Enter areaSearch for Tegwyn further to the west in the Wadewater1/1
8 Use itemExamine the abandoned wooden sword1/1
9 Speak toMeneldir (Show dialog)
'This does seem to be Tegwyn's sword....
'That is not a good sign, Player. Let us listen once again, and hope this time we hear something. He may not have much time left.'1/1
10 Emote/listen1/1
11 Enter areaSearch for Tegwyn to the north-west in the Wadewater1/1
12 Speak toTegwyn (Show dialog)
'I'm here... I'm here, Player!
'Your adventuring lessons were not complete! You didn't mention how cold and damp it would be, or how often things would be trying to kill me! I stayed away from the avanc, because I'm no fool, but even the turtles here tried to snap at me!
'Still... it was quite an adventure, for my very first! If you're planning to scold me, you can forget about it... because I learned something important! I know where the Uruks are going!'1/1