Iteresting idea. I just explore the world with seed "uZReVrT9xW" . On the spawning island is very few burial crypts with very few surtling cores inside. On the initial isladn i started with 7 surtling cores - it is not enough for the bronze smelting (i have made the coal, then smash the furnace and made the tin, copper and bronze ingots, then smashed again ...). Also there is very few troll caves and if - they are empty ...