The item ID for Mountain boulder 1 damaged is rock1_mountain_frac
This is the spawn command to give yourself Mountain boulder 1 damaged in Valheim normally without the level option.
Copy the command below and paste it into your Valheim game or server admin console to obtain.
This is the spawn command to give yourself Mountain boulder 1 damaged in Valheim with the level option if applicable. Below is just an example with the item chosen. Some items do not have leveling.
Copy the command below and paste it into your Valheim game or server admin console to obtain.