This mod was made to go along with Gregtech so you didnt have to use adventure mode but had an incentive to use the proper tools and watch where your swinging!
You take damage from punching anything there is a proper tool to harvest other than dirt, or by using the wrong tool.
Note: This mod uses the vanilla material System to define which type of damage should be applied, and there are a couple exclusive ones that don't cause damage. If the mod doesn't use the materials that don't hurt then its ment to hurt.
You are allowed to use this mod modpacks if you wish.