Territory of Beasts: Just before territories are decided, players roll off. The winner can set one MONSTER within 3” of the center of the battlefield. This is referred to as the monstrous denizen. Any MONSTER from any faction can be chosen. If the MONSTER is a mount, then it does not have a rider: ignore all rules that refer to the rider and use only those that apply to the mount. If there is uncertainty about any of them, roll off to decide.
Then the other player also places a monstrous denizen, following the same rules, more than 3” from the other monstrous denizen.
At the start of each battle round, before determining priority, players roll off. The winner treats the monstrous denizen as a unit in their army for the duration of that battle round, and their opponent treats it as an enemy unit. The other player in turn controls the other monstrous denizen. The monstrous denizen’s commanding player can choose to attack it, but if they do then immediately they treat it as an enemy unit until the end of the battle round, and their opponent treats it as a unit in their army. The monstrous denizen cannot attack itself.