I found the recipe for Enhanced Thunderbolt quite a while ago, but I'm still missing one particular ingredient, the Endrega embryos.
I've killed several Endregas in the meantime, but none have dropped an embryo. It doesn't look like I'll just stumble upon them any time soon, so I'm now trying to find where exactly I should look.
Which Endregas actually drop this item? Only a particular type like Warriors, or does this somehow depend on the monster level? And where can I find enough of the correct type of Endrega to finally get some Endrega embryos?