Even on low spawn the monsters are absurdly powerful and it's entirely intentional. In fact, the domain has already been made a bit easier than it was to begin with by my understanding-but it's exactly what it's meant to be-a high lvl party wiping machine
Speaking of I think the lvl it's intended for is 17+, but me and some other people have managed to hold peoples hand through it as low as lvl 12 or 13 I think?
I really would be upset if it was made easier though, it's the only challenge that any high lvl characters have on the mod. It might be so dangerous that people don't go that often, sure, but that's fine with me. Makes it that much more of an event. It takes planning, preparation, strategy, a good team that can work together. I like it a lot!
edit: it should be noted that, while we have managed to bring people along to show them around-they generally tend to die horribly. I think the lowest level who came with us was actually a paladin as well and they were smart so they actually made it