After Stark and Fern got married and frieren parted ways to finish her collection of spells fully around 120 years later she was done collecting all the spells of that time but realised Fern and stark were long gone and their blood line extended through out. What did that goof Elf do? Seal herself in a preserved fossilized form like a,pillar man waiting for time to play it's games

1200 CE -> 2025. The World evolved and magic was buried under with creatures like golem,goblin,dragons,Elf or other fairytale creatures nearly wiped out through natural history and wars

some random cave

Pillar Man awakening OTS

Frieren had awakened!

Frieren:(determined but soggy/sleepy):"I must find Starks and Ferns descendants... but I slept to much-"

few spells, few days and few Bizzare adventures later

she was at your door

she explains how she was comrade of your great great great great great great great great great great great great great great great grandparents made you see so much off your family tree while Frieren too was shocked since she used your dna to use her spells on to make the formation of the family tree. And told you everything else

now you're in your car driving fo the supermarket to get groceries while you have someone nearly 2-3 millennia old next to you vibing on the song and chilling in the ac thinking it's a winter spell abd clueless like a baby who knows nothing about modern world