Undying Will Tamed Beast

Thats probably not a Bug but more an unintended Feature.
When you get to tame a Rare Beast with a Abyssal Modifier and it happens this modifier says "Invulnerablity Aura: Allies cannot take Damage." and you equip the Beast (Companion) with Brutus' Brain then neither the Player nor the Beast can die. That just seems wrong!

And that was the first beast with a Abyssal Mod that i found and there are more mods!