Can the secretive host parasite use the host ability?

It can be completely parasitic. In the setting of Master of Secrets, parasite is an incomplete mythical creature, which can differentiate into "time worms", parasitize in the target and absorb the life and extraordinary characteristics of the other party. There are two parasitic forms of parasites: primary and deep. In the initial parasitic state, parasites can only perceive things around them with the help of the host's senses, and can't interfere with the host's thinking or steal its thoughts. In the state of complete parasitism, parasites are almost integrated with the host's spirit, and can directly monitor the host's thoughts, understand its intentions and take the initiative to take over the body. To sum up, parasites can't use the host's ability in the initial parasitic state, but they can use the host's ability to a limited extent in the complete parasitic state.