Volcanos and vents

There will be unactive volcanos on the surface that give shattered obsidian that takes 1/2 the time to mine and crafted with nine makes 1 obsidian making a source of obsidian. Underwater are active vents and lava trenches that can't be accessed by 10 blocks with damage and need a special scuba gear to reach the that give obsidian, heat weeds, and lava fish. Lava fish will attack with 2 damage and have 10 hearts and drop 3 XP orbs.