This article is from the Final-Fantasy and other Square Soft Games FAQ, by email@example.com (Nick Zitzmann) with numerous contributions by others.
Probably the best way to defeat him is to perform a single weak attack
every turn up. Conserve your characters' AP, build it up to the maximum
of 26 points, then _really_ let 'em have it in the Combo menu! Don't
forget to heal your allies should Redrum use his excessively annoying
Redrum is quite difficult, so don't be discouraged if you can't beat him
on the first try.