How to get hellstone quickly?
Solution 1:
Craft a lot of Obsidian Skin Potions and go ahead! You need fireblossom, waterleaf, obsidian and water bottle to craft them.They work 4 mins and each one can get you some stacks of hellstone. Hope this help you.
Solution 2:
Make an inside an obsidian head and equip it. It will let you be immune to fire blocks. Then just find a safe place to mine the hellstone because once you mine it, it will let out lava. An easy way is to mine over it with something in between you and the he llstone then mine it. I got 93 hellstone doing that.