Although they haven't been shown in any combat situation so far, it's clear that the Gods' Knights are going to be the final villains of One Piece's Elbaf arc. Their ultimate plan has also been revealed, where they are conspiring to kidnap the children of Elbaf to hold them hostage, and, in the process, weaken the country enough for them to issue a forceful takeover of the one island that has eluded the World Government for over 800 years.