Spark of Creation (Vial)

This Alchemical Item is a magic item. When you take the Attack action, you can replace one of your attacks with throwing a Spark of Creation. Target one point you can see within 20 feet of yourself. Eight 5-foot diameter crystalline spires burst forth at points of your choice within 30 feet of the point. Each spire has a height of up to 30 feet, with AC 5 and 30 Hit Points. When reduced to 0 Hit Points, a spire crumbles to rubble, which creates an area of Difficult Terrain with a 5-foot radius that lasts until the rubble is cleared. Each 5-foot diameter portion of the area requires at least 1 minute to clear by hand. If the spire is created under a creature, that creature must make a Strength or Dexterity saving throw (its choice, DC 8 plus your Dexterity modifier and Proficiency Bonus) or take 6d6 Piercing damage and is Restrained if it is pinned between the spire and an obstacle. The Restrained creature can use an action to make a DC 16 Strength or Dexterity check (the creature's choice). On a success, the creature is no longer Restrained and must either move off the pillar or fall off of it.