Fenrir

A neutral mob that is a subspecies of the wolf, it appears in the ice and snow biome with a fairly low probability.
It is neutral to the player, but it is hostile if it attacks Fenrir himself or a wolf near Fenrir.
When Fenrir becomes hostile, the wolves also become hostile to protect Fenrir.
And Fenrir howls and gathers the wolves to Fenrir.
The difference from a normal wolf is that it cannot be tamed and is twice the size of a wolf, so it has twice the physical strength and attack power of a wolf.
However, you will trust the player by giving them bones instead of being unable to tame them.
If you have any other good ideas, please let us know in the comments.
Thank you for taking a look at my idea.