Unlike its predecessor, the Gorgon Blade (also known as the Medusa Sword) seems to inflict gradual petrification status less than any other status infliction that is possible. It is curious because the chance to inflict a status is based on the level of the attacker and target... it's rather strange that this is the exception.
A possible cause is that it may inflict the "earlier" version of the status... which starts the target at 1/3 Petrify.. but it might not display the message at all (or is missing one altogether). There's something strange about this behavior anyways, as it takes multiple hits to bring the status message up...
Anyways, go figure, someone probably goofed here while redoing the whole system anyways. The target will die on its own because of gradual petrification anyways (it's fixed unlike the SNES counterparts, I was trying to test the Stop bug)... too bad it is at the cost of being ineffective.
Probably should catagorize this as "worst status revision ever".