Predator
Previously before its breakthrough, the Crust-Mantle wasn't anything impressive, only possessing a Sync Rate of 64 percent. Moreover, it had been at Tier 1 for almost 7 years, a period too long for even Frenzy Beasts.
This showed its lack of confidence to even breakthrough to Tier 2. But now, not only did it successfully breakthrough, its Sync Rate even shot up to a staggering 97 percent, surpassing common sense.
Raising the Sync Rate by even a single percent required a Tier 5 Frenzy Fruit. The Trait of Severability consumed the full capacity of a Transformer's Heart Crystal to increase the Sync Rate by one percent. This fact alone showed how difficult it was to raise the Sync Rate. After all, it meant regenerating the lost body parts of the Wisdom Parasite while simultaneously fusing it with the host.