So detect magic doesn't work but is that because HP spells have no Aura? I saw that the wording of antimagic field says "any spell or magical effect used within". Open wording sorta like D. Pois and D. Invis. Fiona as some kind of magic immune monkstrosity

Heh heh, yup. Antimagic Field would probably work against HP magic. It’s a pretty high level spell, though.