Bathycite ore is a higher rank or + item found in the flooded forest. You will need to be in an upper rank quest to ge it. I found it in areas: 1,4,5 and 8
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mining in the volcano
Mining in the Tundra.
You can buy pickaxes from the lady who runs the stall towards the left area of the village. Also if you like you can make one yourself buy combining iron ore with a bone.
It is supposed to be Alatreon but i feel the most difficult is Deviljho in the quest world eater.
when you have repeled the lagiacrus and you are on the five star quests you can forge a bone long sword.