The item ID for Bonemass' AoE attack effect is bonemass_aoe
This is the spawn command to give yourself Bonemass' AoE attack effect 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 Bonemass' AoE attack effect 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.