  Replica twist defects are of codimension two and enter in quantum information
when finding the R\'enyi entropy. In particular, they generate n replicas of
the bulk conformal field theory. We study the monodromy of such defect and
learn how a global O(N)-symmetry is broken. By applying the equation of motion
to the bulk-defect operator-product expansion we are able to extract the
anomalous dimension of defect-local fields.
