I know that the correct mob is the Halistoper and not the regular Stoper.
My problem is, I use the potion on the thing and it doesn't kill it. My BLM doesn't stand a chance against it once he attacks me with his breath (it renders me useless and I can't attack...).
How do I complete this quest?
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EDIT for DAILY LIMIT: Thanks for the tips. I was thinking the potion was supposed to actually kill it. And for some reason, the breath hits me even when I move out of AoE range. I'll rethink my strategy next time. Now I have my chocobo to help me.