Warpiglet
Adventurer
If you don't want an issue between the halfork and elf, don't purposefully do dream sequences and the like that are coaxing the halfork to have issues with the elf.
Is it so important that you treat your world "internally consistent" in your own mind that you force the two PCs into conflict just because you can't see them working together? In my opinion, at some point you need to just let the players do what the players want to do and slightly bend your rigid thoughts on how things "should be".
Let the players figure out whether an elf and halfork can work together. They'll come into conflict soon enough without you pushing them.
You know, I think this is good advice. It could be that being orcish to the noble is being brave and savage in combat. Perhaps they are not as focused on taking elf scalps. why force it?
In 3e they had gruumsh as a possible deity for at least neutral characters. at that time it started looking like the lore suggested a cleric of gruumsh might find common ground in a party.
if you insist priests of gruumsh are murderous psychopaths, perhaps allowing them in the party should be reconsidered.
maybe gruumsh is different in your world.
insisting they are murderous psychos AND allowing them in the party will not end well.