(NOTE: Galacticraft and AppliedEnergistics2 are dependencies and the mod will not work without them)
The Pocketknife mod adds two new tiers of tool material above Diamond, Adamantite and Crystalline. Both require abundant materials and machines from Galacticraft and AE2 to craft, but are well worth it.
The mod has config options to toggle the various items and materials off and on.
The Pocketknife Team
