Complex sentence: Never actually used by Firebrand and only imperfectly used by Phalanx; erroneously thought by some to be the crest backing Firebrand's "Ultimate" form.
Split into simpler sentences: Never actually used by Firebrand and only imperfectly used by Phalanx. Erroneously thought by some to be the crest backing Firebrand's "Ultimate" form.