Originally Posted by
Death13a
Logia user can reform or fuse with their element. That how logia user regenerate by using their element nearby and making it part of their body. Paramecia can't use external elements to repair their damage.
Blackbeard's ability is to nullify person's fruit power on direct contact, which means he nullifies his own ability to regenerate/fuse with darkness .
Brook's revive-revive fruit allowed his soul to comeback from dead in a body, i wonder did it had to be his own body or anyone else?. Can he call back others back too from dead, and revive-revive fruit is not completely paramecia or logia, it keeps Brook from separating his soul from body but it just basic function, I kinda hope he can separate from his body and possess anyone's body even for few minutes, revive dead people(scripted plot-hole).