Warenai is a new ore added by the Dragon Block C mod, used to craft a number of Dragon Block C items.
Obtaining
Warenai ore can generally be found from the surface to several layers underground. To mine it, a wooden pickaxe or stronger is required, yielding a single Warenai Crystal per ore block.
Using Silk Touch on Warenai ore will drop the Warenai ore block, which can then be smelted into Warenai crystals - though, it will still yield one crystal per ore block.