Caltrooze

Filled with a caustic mixture that discharges when stepped on, these tetrahedral caltrops present a much more dangerous hazard than their mundane variety. A typical bag of these 1-inch health and safety nightmares contains 20 caltroozes. Small bubbles of acid forming and bursting inside the caltroozes cause them to roll and shift. Caltrops. As an action, you can spread a single bag of caltroozes to cover a 5-foot square. Any creature that enters the area must succeed on a DC 15 Dexterity saving throw or stop moving and take 1 piercing damage. Until the creature regains at least 1 hit point, its walking speed is reduced by 10 feet. A creature that moves through the area of the caltroozes at half speed makes the saving throw against them with advantage.   Corrosive Chaos. If a creature fails the Dexterity saving throw, roll a d4 and consult the table below to determine what additional effects take place:  

d4	Effect
1	The acid in the caltroozes discharges in a single burst. The creature takes an additional 6d6 acid damage.
2	The acid takes on lubricating qualities. While the creature’s speed is reduced by the caltroozes, it must succeed on a DC 15 Dexterity saving throw at the end of each of its turns or fall prone.
3	The acid coats the creature’s feet, continuously eating away at them. While the creature’s speed is reduced by the caltroozes, it takes 1d4 acid damage for every 5 feet it walks or climbs.
4	The acid causes a creature’s feet to temporarily deform. While the creature’s speed is reduced by the caltroozes, it has disadvantage on Dexterity saving throws.

After a creature fails a saving throw against the caltroozes, they are emptied of acid, and you can’t use this property again until you spend 10 minutes decanting a phial of biomantic acid into all the caltrops. The caltroozes can still be used as regular caltrops that deal magical piercing damage.