For me it is about a 50/50 chance I will find the spot before the ID stone.

For Yag I run about 95% never find the ID stone.. out of 30 worlds I found the Yag ID stone once.... and that was just a lucky stumble upon

I suppose that's fitting i guess....I had the Yagluth location before I even had the Bonemass location in this world. In my previous game i had Moder's location behind the first ice wall in the first ice cave, but never found a Yagluth location in 7 plains biomes

After many full runs, I have never found the vegvisir for yagluth prior to finding the altar... Including this last time, where I had already seen the altar and was going to it when I found the vegvisir, literally this far away.... GREAT help that vegvisir was. LOL

https://steamcommunity.com/sharedfiles/filedetails/?id=2860212327

Congrats! She can be hard to find sometimes.