I really do need your help to solve this riddle

Any thoughts on a word or two that might be included?

How about "Voyagers reunite."

Hi. At least a solution that makes a bit of sense.
The thinng is. When you build just one word, lets say river or tree, or stone there aren't enough letters left to go on. I don't know which words the solution should contain, but the riddle is from Heroes of Might and Magic 3. It's a game with a lot of fighting and magic. There are trees and rivers everywhere and stones. Green fields, treasure chests and castles and monsters and artifacts that are making you stronger.
There are ressources involved. wood,ore,mercury,sulfur and crystal.
But it maybe isn't connected to the whole thing. I dunno.
Those are some words you can build out of this ( I hope) anagram.

air,at,aries,eat,ever,is,on,ore,over,green,grey,grave,gore,gone,go,give,given,
grease,great,gear,see,sea,seen,sorry,sure,sit,sin,sun,story,stare,stair,starve,
stay,star,stone,ray,rain,rare,reign,run,rust,rusty,rest,river,regret,
never,nose,no,not,near,to,ten,tea,toe,true,tray,tear,try,tree,your,year,
yearn,yoga,yeti,vote,usa

that's all I could figure out.

Is there any context to the message? Is it during a quest, is it spoken? Written? By whom?

No context. no quest, this is the whole text. It stands on a sign, that u can read, by clicking on it. it's just there to be a riddle. completely seperated from the story of the game, as far as I can tell.

Is the bit about "to he who may unscramble this message" part of the sign?

On the sign is written :

To he who may unscramble this message:
A Greene Virus Toy.
The heavens shall smile upon thee.

some other words are :
ear,eager,anger,rose,store,one,three,four,five,seven,eleven,fourty,seventy,serenity,eye,
eyes,ivory,teen,N.Y.,iron,meat,siren,

http://www.wordsmith.org/anagram/

Treasure Give Yon

Give (a) treasure, get a blessing?

what I like as a solution is

negate surveyor I, the I could stand for the 1 . lol
whatever

or

eager,virtue,nosy

or
anger restive you