Back in MCP days we mistakenly named Entity.canChangeDimension as Entity.isNonBoss and most people seriously used that method to determine if something was a boss or not.
Now that we have the actual name, there's no longer a way (that I know of) to determine whether something's a "boss mob" or not.
This ticket proposes an entity tag be added forge:bosses that mods can add their bosses to.
Back in MCP days we mistakenly named Entity.canChangeDimension as Entity.isNonBoss and most people seriously used that method to determine if something was a boss or not.
Now that we have the actual name, there's no longer a way (that I know of) to determine whether something's a "boss mob" or not.
This ticket proposes an entity tag be added forge:bosses that mods can add their bosses to.