Tainel doesn't remember how he died, except for that it was the kind of garbage death that would get his goddess sniping frostily at him for weeks. Tisvetaia, goddess of preservation, whose touch can immortalize mortals themselves, does not like losing things she likes. Especially people. Particularly when one of those people might, for example, be the one and only acolyte she chose to trust with her life and her power, in a very literal sense. Forever, because again, goddess of preservation. Tainel doesn't personally do a ton of the preservation poking, it's kind of inefficient, but he definitely can. In theory, any acolytes she chooses would be with her forever, until death of something other than old age, or if they betrayed and murdered her to ascend to godhood themselves. Kind of makes that sort of thing a big deal. This does starkly prove the difference between comforting theory and the hard and cold dash of messy reality, doesn't it.
Honestly, he doesn't mind much on his own account, he's of the opinion that this would have happened eventually. But he does mourn what it'll do to his goddess, who will be furious and inconsolable and might need to erupt a bit of her domain in a blaze of outraged molten grief, now that he thinks about it. Sorry, Tisvet. He was trying to make it forever, just. The world got in the way. That happens sometimes, but it sucks every time. It's what he's thinking of the most, as he navigates the dream-like state of journeying to what he thinks is his afterlife, that she'll be upset. He knows she'll miss him. He'll miss her, too. For all that he calls her his goddess, she's often more like a best friend, or maybe a sister, prodding him for his opinion and offering wry commentary on things and sighing dramatically but supporting him in whatever he does. He's had her with him for decades, now, and most of his life. Losing her will be a bit like losing a bit of himself.
If he could bring a bit of her with him to... wherever it is that he's going... then that'd be pretty nice.