The critical strike rate of Xinhai was negative because of the existence of the temple of inherent talent. When unlocked, the temple of inherent talent in Xinhai will increase the healing bonus of Xinhai by 25%, but it will also reduce the critical strike rate of 100%, so it will become negative.

With the decrease of critical strike rate, Xinhai no longer needs to superimpose attributes such as double explosions on sacred objects, but can fully superimpose health points and healing bonuses. Although the upper limit of damage is lowered, it can improve the healing ability and also improve the damage of Xinhai, and there is no need to entangle the attribute selection of sacred objects.

In short, Xinhai's crit rate is negative because the innate talent temple has completely reduced the crit rate by 100%, so unless you stack the crit rate above 100%, it will always be negative.