Which hydra spots are nerfed?

[The Legendary Joe]

Actually, the hydra's in amatsu don't drop any items and only give 1 exp, but farming items still work on them

and Alchemist summoned Hydra's are nerfed for the very reason that they can farm hydras without ever taking a single damage, so gravity made it so they don't drop items or give exp.

I've gotten hydra's from thara frogs, Both of the Hydra pools in payon (The munak /bongun floor and the Sohee floor), and the sunken ship. I haven't found one in byalan, but I know they have drops, because I use their meat when I run out of fish to eat while killing other fish

Many people stop beleiving the card exists or the monster is nerfed after they killed 10 zillion of a monster and they still haven't gotten the card. It may be that you're just very very unlucky