Elemental Fury

You take out a gem, concentrate for a moment and energy begins to course through your weapon. Your weapon begins to brim with elemental energy dealing for damage for up to 5 minutes. The gem is consumed upon use. Your weapon deals an additional 2d6 damage based on what type of gem you used, in addition to the following effect.:

• Opal (Necrotic Damage) - You heal 1d4 points of damage for every hit against a target
• Sapphire (Lightning Damage) - Unstable lightning arcs across the blade, with each hit bolts jump across to anyone within the nearby area. Creatures within 30 feet take 1d6 points of lightning damage
• Ruby (Fire Damage) - The Target must make a dex save, on a failed save the target becomes engulfed with flames taking 1d6 points of fire damage at the start of their turns
• Emerald (Acid Damage) - Acid drips from the tip of the blade and sprays onto the target with each hit, dealing 2d4 damage with each hit
• Diamond (Cold Damage) - Cold winds surround the blade, the target must make a con saving throw. On a failed save, the target takes 1d6 cold damage, and it has disadvantage on the next weapon attack roll it makes before the end of its next turn.