what if it was Dionysis's gift and that could only heal Asterion specifically? I've not seen his vote yet, but it would make sense
it can still be dionysus gift, at very least the system that creates them should be. but would he really make wine that only heals asterion arbitrarily like that? for what purpose? makes more sense that what is used to make the wine would be able to cure asterion, it just so happens that it would poison others, and is likely a limited resource
In Greek mythology ichor is poisonous to mortals as it's usually described as blood of a god, it's either intentional they added ichor to the wine as a way to stop mortals stealing the wine from its intended user or it's just bi-product of its process to making the wine. It could cross the line as it would be an insult for a mortal to even attempt to consume a divine substance.
yeah, that's what i'm saying. ichor would fit this property of the wine. the idea that it's made with asterion's blood specifically makes for a self sustaining production, the more he gets hurt, the more healing is available to him. the one blindspot i'm still unsure is why production ceased when the hotel was abandoned, there may be something else caused by other people being around to make the wine.