This boss is a joke, but I'm pretty sure it's another creature from Greek mythology. Either that or some kind of Europian mythology. Man, I should have looked some of these up on the net before posting these. Pretty cool looking nonetheless, just too bad they didn't make it harder.
You also encounter Maria again after this fight and a revelation is revealed.
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Dialogue Data: Alucard's Dialogue in the PSX Version (edit) Image/ Participants Transcript...
Castlevania: Symphony of the Night (fan commonly abbreviated SOTN/SotN, Konami abbreviated SoN...
Script for dialogue found in Castlevania: Symphony of the Night.