Chromatic Crossroad
This item is a pair between a square shield and a bladeless Shortsword. While holding the shield, you have a +2 to your AC. You can activate the shield's ability by taking one of the gemstones and placing it in the middle
Ruby (Fire): A curved, thorny blade made of molten rock and a scaring flame is created. The to hit is STR+Proficency+3, it has a reach of 10ft and deals 8d8 slashing + 8d8 fire damage. Each time a creature is hit by this, they must make a CON save or take an extra 6d6 fire damage per turn
Sapphire (Water): A frozen blade that emits a freezing aura is created. The to hit is DEX+Proficency+3, it has a reach of 10ft and deals 8d8 Piercing + 8d8 Cold damage. The ground within 10ft of you is considered difficult terrain and creatures must make a DEX save or fall prone when inside the difficult terrain
Emerald (Earth): A large but blunt crystal blade that feels weightless in your hand is created. The to hit is STR+Proficency+3, it has a reach of 10ft and deals 8d8 Bludgeoning + 8d8 Force damage. Once per turn, a creature hit by this must make a STR save or become restrained in crystals and must make another save at the end of its next turn
Diamond (Air): A whip-blade made of crackling white lightning is created. The to hit is DEX+Proficency+3, it has a reach of 20ft and deals 16d8 Lightning damage. When you hit a creature with this attack, any other creature within 10ft of that will take 6d6 lightning damage