The Hundred Ghosts Sword is indeed an Immortal Sword capable of summoning ghost creatures equal in strength to its wielder.
Zhou Heng believed that Immortal Artifacts definitely had different grades. This Hundred Ghosts Sword could not possibly summon a ghost creature as powerful as the original owner of the Black Sword, for the Hundred Ghosts Sword was far from that powerful!
In the hands of the original owner of the Black Sword, this Hundred Ghosts Sword would probably only be reduced to shards, just as Zhou Heng would be when using a Spirit Gathering Realm Magic Artifact.
However, Zhou Heng was only at the Nascent Soul Realm, far from reaching the limit of this Hundred Ghosts Sword, so naturally, there was no need to worry.
Swoosh, swoosh, swoosh, rows of Ghost Shadows rose into the air and headed toward the waves.