Overview
StoneTowerRuins05 is a Valheim world location that spawns in the mountain biome, identified internally as StoneTowerRuins05. World generation places up to 50 per world, with terrain constraints (min altitude 150, delta 6-40), and an exclusion radius of 22m, which is why some seeds have far more of them than others. The data tags it as slope rotation and randomly damaged.
About
StoneTowerRuins05 is a collapsed stone tower ruin in the Mountains. It may contain a chest with Mountain-tier loot.