I've found the opposite on my original seed, I went East to the edge, and worked my way back to main base

I am dead at the bottom of a mine where my body is camped by a 2 star seeker and a bunch of ticks,, so Im probably not the best at giving advice.

ive searched 3 entire mistlands islands on a fresh seed*

Was about to start a similar thread and found this. So that explains the necro.

While I don't necessarily think there need to be more dungeons, some of the spawn rates for things needed that are found in the dungeons do need adjustment. It should at least be a bit less of a grind finding the black cores to get started on the mistlands items. That was the worst grind for me in this biome.

use a map viewer like Valheim World Gen

Rng is Rng. I got 5 cores in first mine, and then no more mines for quite some time. I am on my third now, the second had like 2 cores, and the third is the motherload, already 50 jelly, 3 cores & 2 or 3 fragments (up to 5 total now) ... and Ive only done 2 wings of it.

All I can say is that spotting these is tough. I thought that spike fences and a dwarf meant no dungeon, but circled back and discovered the mine in spite of that. There isnt a hard and fast rule that i have found -- check every black marble building. And not sure if they can be buried -- Ive even dug a little below a few of the abandoned ones I found.

I don't like the core progression thing either ... its a repeat of the forest and you either find a bunch or none at all in a dungeon, with the dungeons being much rarer. At least most forest have them every 5 min walk or so.

According to the wiki, I have more than enough of all the parts to make a fully upgraded set of carapace armor, and I haven't found my first dungeon yet, so I have to agree. Seems to be way out of whack to me.

since release? what last night?

ive searched 3 entire mistlands islands on a fresh seed*

This is my experience as well considering that I have found only 1-3 cores per infested dungeon. So far I have only found them near the coast of my biomes because they are the easiest to see due to the large staircase that leads to them.

The only exception is that I remember falling down a staircase in one of the marble structures located inland that led into a another infested dungeon opening. The unfortunate thing is that I died at the entrance before I could mark it on my map and I simply cannot find it again.