The Limestone in Hades 2 is a Reagant that can be found all over the map and is still not visible. This is mainly because this resource is obtained from cream-colored rocks that blend in with the environment. Finding the Limestone is necessary because it is a key ingredient for various Incantations. Not only that, it is also a requirement for crafting various Weapon Aspects. So during your Hades 2 playthrough, you will need Limestone in abundance.

Limestone can only be found in Oceanus, the second biome in Hades 2. To get here, you need to go to the end of the Erebus biome and defeat the Headmistress Hecate boss. Once you've finished with Hecate, you'll be teleported to the Oceanus biome. There, you need to find cream-colored rocks stacked on top of each other. These are the Limestone Nodes that you can interact with to get Limestone.

Unlike other resources like Deathcap and Lotus, Limestone in Hades 2 cannot be picked up with your bare hands. Instead, you’ll need a Crescent Pickaxe to do the job. So make sure you have a Crescent Pickaxe before you start your run.

If you have the Reagent Sensing Incantation, you will know immediately if there is Limestone in the room. Reagent Sensing will point you to collectibles after you clear a room. For those who don't know, this Incantation only requires 1 Moly to craft.