Detonate

You attempt to place a spark of explosive psionic potential into a creature you can see within range. The target must make a Constitution Saving Throw. On a success, you can choose to deal 4d10 Fire damage to the target. On a failure, the target is imbued with the spark for the duration.   While the spark is inside a target, you can use an Action to detonate the spark. The target takes 8d10 Fire damage, and each creature within 20 feet of the target must make a Dexterity Saving Throw, taking 8d10 Fire damage on a failed save, or half as much damage on a successful one.   Increased Order. When you manifest this power, you can increase its order by 1 to increase the damage of the detonating spark to 10d10.