Well the MC has a way with the ladies. I could see him seducing & later swaying Vixenatrix to forgive & forget the whole "stolen tear" thing. She mabey even willing to aide soley to keep the tear safe as the MC promised.
Now before I continue I want to make it clear I'm not arguing or trying to be an ass... I'm genuinely enjoying this discussion lol (I've been told I come across like a dick on forums...)
Tbh unless Tink has said so in his Discord or Patreon (which I admit I am apart of neither) we know VERY little of his Elves. Yes they come from there own lands far from Weirdwood, yes they "own" all the wells & are ruled by a High Elven Council, & yes Liandra was a wild child but she was often known for getting into orgies so she isnt the first or last loos Elf (her parents just seem to be uptight & protective). We have heard no mention of there actual culture, religion, gods or beliefs at all. Everything you have said seems like speculation based on OTHER works & how elves are depicted in them. Erevi is a dark Elf who is devoutly loyal to Nergal & Caleah is a Swamp elf who seems to have her own spiritual beliefs (only joining Qetesh out of desperation & need).
Elves are an open book until our great Lord Tinkerer deems us worthy of more.
Tinkerer shares some lore of the Elves with us by talking to Liandra and learning abit of her previous live aswell as their society.
I could have sworn that she also mentioned that Elves worship other deitis than humans in one of those lore discussions.
That aside it fits the sterotypical image of Elves that Tinkerer so far only encouraged on us.
In regards to the Elves and Vixenatrix... tehre is a better chance for those 2 factions to build an alliance than Vixenatrix and humans.
Here is a new idea... The Player does not pay any attention to the situation around him and helps to militarize both Quetesh and Nergal further... the other factions notice that... Goblins and Orcs get more agressive and attack the Elves, Dragons and Giants in the Area... the Factions call for a summit in order to discuss that situation.
Dureing that summit one of the wild Species (or maybe an alliance of Goblins and Orcs and or Trolls) attack an Elven Outpost close to the neutral negotiation Grounds... the outpost is as previously mentioned understaffed and they are close to being overrun, their Scouts try to call for Help from any Faction possible nearby... maybe one goes to Vixenatrix or the humans of Weirdwood... the Players encounter him and supports the fortress. He manages to get in and has to sit out a siege. He learns about the troubles in the area and realise his own infolvments... aswell as the upcoming consequences.
At some point he is brought to the summit in order to share his knowledge about the reawakening of the 2 believed fallen Gods.
Elves, Giants, Dwarfs, Dragons, (Halflings?) have to decide how to react to that revelation... War would mean utter destruction for maybe all factions... so maybe it's time to make a Plan to neutralize the thread of war between the enemy factions.
Considering the Peasant's unique position in this conflict he'd likely be the cornerstone of any strategy.
The best case would be to make the highpriests and their "Generals" betray their Gods and seek a peacefull coexsitance or atleast negotiation