Although they are both ghost ships, the sensation of Aige's physical vessel sailing through the sea is somehow different.
Other ghost ships rely on a large number of specters to provide power and must also part the seawater to move forward. According to Amberser's understanding, ghost ships can only temporarily turn into an ethereal state to dodge attacks. This ability lasts a very short time, roughly three to five seconds, and its usage is also limited.
But Aige is different; her physical form can maintain the ethereal state constantly, leaving only a semi-transparent phantom image that prowls stealthily in the gloomy depths of the sea.
You can't see it clearly or touch it, completely ignoring the effects of seawater, so its stealth speed is extremely fast.
Moreover, not only the ghost ship itself, but all the people and items on board also enter the ethereal state simultaneously.
"Your ship has already left the Prime Material Plane, hasn't it?" Amberser asked.