You can use this to tame a Karkinos better. Just put it on a Catapult and you're good!

If you are on old mobile you can craft 3 boulders at a time using 3 metal ingots and 30 stone. If you are on other versions you can only craft 1 at a time using the same amount of ingredients.

You can craft These in the turret

Who said that these are late game times,

That's wrong. Get ot right!