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Between that then and the ever-besieged state of Hewe, there doesn't seem to be clear solution to maintaining some route between your two towns. For now, the best you can hope for is simply these infrequent (monthly) visits by envoys between towns, with whom you can send only what they can transport. It's better than nothing but by no means proper trade. At least you aren't constrained by reality or the mundane, and can provide divine goods which are worth much more than their size or weight... at least you could, if you had use of a divine realm.
For example, blessed seeds and saplings which could grow quickly or in prohibitive environments, and bearing fruit which provides health and healing... or in a sinister way, terribly love-inducing fruit that could be left out for enemies to disastrous results among their ranks. Or perhaps trees with bark and timber, able to withstand fire or stronger than steel, whatever your imagination might come up with to help the people of Hewe. But these divine things, you would need to take from a divine realm, which you have not. There is your realm of Death, which you might have been able to draw deadly artifacts or goods, but you know that you cannot venture to your realm now without risking elven harm to yourself. The best you can really offer are cats, living and spiritual.
<span class="mu-r">"Please be welcome in our walls then, and take freely all that is available. Whatever you can carry back with you, we will provide."</span>
In the meantime at least, you can invite the envoy to stay and recover from their travel, while you think up a solution to the problem. Of course you might also like to get to know that dragon slayer closer, but for now you'd hate to have this problem weighing on your otherwise lovestruck mind and spirit. Since labor and assistance by your people isn't much an option, you're not sure what you might be able to do to ensure safe trade, apart from you yourself traveling to Hewe and bringing your influence along with you there to spread peace and love. A river route would of course be perfect and is possible to you, but not in any reasonable amount of time, it would take years to redirect and carve a river across the land all the way to Hewe and probably years more before the environment properly adjusted to this new river and mortals could start using it for travel.