Need help with slaying monsters at the cavern

[scenic stag]

I’ve been trying to finish B.O.S errands. And I’m having difficulty finding the monsters at Earth cavern, for example Sphekter Earth or Pickling Earth. I spent days killing all monsters at Earth cavern but couldn’t find these requested monsters. Can anyone help me please?

P.S. I met Earth Giant at level 40 already

[mental hazel]

Iirc from the wiki monsters page those 2 aren’t working in game