Swarming feywild butterflies fill a 15-foot-radius Sphere centered on a point you choose within range. The Sphere remains for the duration, and its area is Lightly Obscured and Difficult Terrain. You can exclude Allies from the Difficult Terrain effect, making the butterflies magically go through their body.
When the swarm appears, each creature in it makes a Constitution saving throw, taking 3d10 damage on a failed save or half as much damage on a successful one. The damage is random, due to the random nature of the feywildish-butterflies. Roll a D6: 1: Acid, 2: Cold, 3: Fire, 4: Lightning, 5: Poison, 6: Force. A creature also makes this save when it enters the spell’s area for the first time on a turn or ends its turn there. A creature makes this save only once per turn.
* - (The staff)
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