This kind of ability to comprehensively reduce resistance is equivalent to a percentage reduction of the multidimensional defenses of enemy units.
Even though Fang Mu's side lacks attack power, they can still use the sequence-level skill [Abyss Descending] of the Abyss Mermaid to wound the target.
Now that the sequence-tier Abyss Mermaid has joined the battlefield between two God-Realm experts, whichever side the Abyss Mermaid aids will tilt the battle in their favor.
Of course, the prerequisite is that the God-Realm expert being assisted can adequately protect the Abyss Mermaid.
In terms of the evolutionary path, Fang Mu intends for the Abyss Mermaid to evolve toward the King-tier evolution of the Deep Sea Mermaid.
The evolution path of the Deep Sea Mermaid is far superior to that of the Soul Refining Mermaid.
The Soul Refining Mermaid is a purely soul-system mermaid whose abilities focus primarily on the soul.
But for mermaids, the water system is their true domain.