Overview
MountainCave02 is a Valheim world location that spawns in the mountain biome, identified internally as MountainCave02. World generation places up to 160 per world, with terrain constraints (max delta 40, min altitude 100), and an exclusion radius of 15 (32)m, which is why some seeds have far more of them than others. The data tags it as slope rotation and interior randomly generated.
About
MountainCave02 is a Frost Cave entrance variant in the Mountains. Inside, players fight Cultists, Ulvs, and Bats while looting Cave tuna, Red jute, and Mountain treasure.