Fang Mu had seen skills that could seal the environmental elemental energy around and interfere with the energy circulation within a target. He had also seen skills that limited the effectiveness of a Beastmaster's Runes.
It was rare to come across abilities that could directly restrict an opponent's unique characteristics.
The Barrier Phoenix, with the skill [Burning Feather Lock], could assist its own side while choosing the most strategically valuable enemy Guardian Beast to restrict one of its exclusive characteristics.
It was very likely that because of the loss of this one exclusive characteristic, the strategic significance of the enemy's Guardian Beast would be greatly reduced.