Middle of Navarn Steppe at NPC Milden. There is also one at Valtara Mountains, north of the actual icon "Valtarra Mountains"
A big stone crab named Kamasylvia Scrub Stoneback Crab. Attack it and smaller adds will spawn, read below!
Hit the big one, and small spawn. Dont kill big one too fast
The big one can spawn small ones 2 times, and he drops 3 at the time, one of each at 70% hp and 30% hp Kamasylvia Rough Stoneback Crab
Kamasylvia Herb Stoneback Crab
Kamasylvia Small Stoneback Crab
Kill the small ones AND use pickaxe on them BEFORE you kill the big one, or else they might despawn. (You can gain knowledge by gathering on monsters)
Do NOT drop the health of the big one too fast at the beginning, he might not summon extra at all if you do that.
I've found 3 kinds of Kamasylvia Scrub Stoneback Crab. Some is big, Some is small. The biggest one will summon the other 3 crabs. I've get the guide from this video. https://youtu.be/jmsV6M_kIqE
можно заагрить большого, дождаться спавна мелких, отбежать, отагрить большого и убить мелких.
u can aggr crab, wait spawn little crabs, run away, unaggr big one, kill little crabs and repeat. https://youtu.be/-alD1KxhfJA