DRK: What if for HP you get-

[Reynhart]

Souleater was introduced to FFIII in the re-release on DS, which came after FFXI. I don't believe Souleater existed prior to XI. I could be wrong, but I'm pretty sure Darkness was the original version of the ability.

I don't think quoting wiki is always a definitive answer.

Darkness...Souleater
Rogue...Thief