Argent Sand

**adapted from Argent Sand by Rowen_Arcturus

The caster conjures a large quantity of silver sand from their position at the center of a 40 ft radius sphere. The sand seems to coalesce freely over solid surfaces and gently flows and shifts on its own with small wisps of sand from within the area hanging in the air as light dust. Hostile creatures that enter the area suffer movement penalties due to difficult terrain, and the caster is automatically alerted to their presence even if asleep. Incorporeal creatures are also detected and have reduced speed as silver dust collects around their form. Flying creatures are detected, but are not impeded. 

As a bonus action the caster can trigger the sands to ignite in a flash of extremely bright light, causing all creatures within the spell's area of effect to make a CON save.  On a failed save the creature takes 3d8 radiant damage and is stunned for one round.  On a successful save the target takes half as much damage & is not stunned. Creatures vulnerable to radiant damage are automatically stunned for one round, and are stunned for a second round if they fail the save.