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Originally in the old world, the three elven races had been terribly hostile to one another, worse even than differing humans among themselves. After fleeing the Old world for the New however, unlike the humans the elves were able to... more or less, and begrudgingly, set aside their differences to unite for their common cause. Letting old hatreds and hostility lie, in favor of survival, and thus the dark elves became the spies, saboteurs and assassins of their kind. Thusly is this assassination and kidnapping plot still part of the enemy elven goals overall, but simply the dark elven response to your godly presence, whereas the common elves responded with a conventional and direct military response.
Incidentally this somewhat relates to the elven relations with the northmen and their god. For it was the northmen who provided transport to the entire elven race, who otherwise were poor seafarers and wouldn't have been able to cross the ocean remotely as well. Ostensibly this secured an alliance between the elves and the northmen upon resettling in the new world, however when hostility against humankind was decided upon, the northmen would easily have been betrayed and slaughtered first... were it not for the god they brought with them. This deity of theirs, the Storm god and a living, human god like yourself. On the one hand he represented far too much strength for the elves to so easily attack, but also he occupied a similar position to the elves as you do with these two would-be assassins; an actual divinity and afterlife.
Not as though the elves expected to be let into the afterlife of the northmen and their Storm god, but the elven uncertainty of the afterlife made them too fearful to attack a god, remnant though he may be. And thus, if their uneasy human allies had a true deity spoken for them, then hence this hoped-for plot by the elves towards you. That they might have a man with some divinity to him, and perhaps even a true demigod if they could not kill you, but in time steal your child. Of course there are a few demigods of the Storm, but the elves would rather some divinity to themselves than the same as their allies.
As to why the Storm god may have hostility against you though, neither of these elves have any idea. Xedeg imagines it's simple hostility between conventional military/political enemies, that you're on different sides of the war and ran up against each other. Shuredi imagines instead that perhaps the Storm god wants you for himself, a divine woman by his side rather than feeble mortal women who rarely would survive even bearing a demigod child. In any case only guesswork can be made of this matter. As far as you're concerned this storm god probably just sees you as a threat, a differing and opposing theology, because that's how you see him as... then again, you did kill one of his children as well.