An unbelievable sight was presented before Mavenna.
In the last five minutes of watching Calidora engaging against the berserk Rex who has his power soaring terrifyingly, Mavenna managed to see the full might of the Royal Black Prince as Rex activated both of his King Marks instinctively.
His power was the stuff of legends in the entire history of Werewolves.
Mavenna had never seen a Werewolf making use of two King Marks during a fight like this.
Normal Werewolves would never have the chance to have two King Marks.
Additionally, even if a normal Werewolf acquired two King Marks, they would experience an energy overload, resulting in their bodies collapsing entirely. It would be fatal for them, but the Royal Black Prince would have no problem handling this.
Since their physiology is designed for this, containing multiple King Marks is their forte.
Other than that, she also got an unexpected surprise.