Overview
Crypt3 is a Valheim world location that spawns in the black forest biome, identified internally as Crypt3. World generation places up to 200 per world, with terrain constraints (max delta 2, min altitude 3), and an exclusion radius of 11 (21)m, which is why some seeds have far more of them than others. The data tags it as interior randomly generated.
About
Crypt3 is a Burial Chamber dungeon variant in the Black Forest with a randomly generated interior. Inside, players fight Skeletons and loot chests for Coins, Surtling cores, and Amber.