I'm trying to create a homebrew spell that fills a similar niche to the Shadow Blade spell.
Add meaningful decisions with significant tradeoffs, rather than raw strength. Using blade abilities leaves you without a weapon until your next turn, and costs your bonus action to reform it.
Allow for highs and lows to combat through the ebb and flow of blade reforming. Costs a bonus action to use the abilities but also to reform the blade, so it is only usable every other turn.
Casting Time: 1 bonus action
Components: S, M (a container of metallic sand worth 20 gp)
Duration: Concentration, up to 1 minute
You form a shimmering blade of metallic sand in your hand. This magic sword lasts until the spell ends. It counts as a magical melee weapon with which you are proficient. It deals 3d8 slashing damage on a hit and has the finesse and light properties. If you drop the weapon or throw it, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the sword to reappear in your hand.
Additionally, on your turn when you strike a creature, you can use your bonus action to change the sword to cause one of the following effects:
- Whirlwind. Your strike explodes the sword into a whirling cloud that surrounds you. Ranged attacks made against you have disadvantage until your next turn. The sword is lost until reformed.
- Piercing Strike. The blow strikes your target and onwards. If there is a creature directly behind your target, you may strike them for 1d8 damage. The sword is lost until reformed.
- Shredding Edge. You send the sand coursing deep into the creature, tearing through its insides. Your blow causes your sword to explode, dealing an additional 1d8 damage. The sword is lost until reformed.
While you are wielding the sandstorm blade, you may spend your reaction to shape it to shield you from attacks, increasing your AC by 3 until your next turn. The sword is lost until reformed.
For context, this is for use with a bladesinger.