Arm/Detonate

You enchant an non-animated, non-sentient object of fist-size or larger but no larger than a knee-high rock. The object is infused with explosive force for up-to 1 hour to be triggered as a reaction or by simply dropping concentration to make the object explode dealing 1d6 fire and 1d8 force damage or half as much on a successful save.

If you lose concentration, the object detonates.

An object infused pulses slowly with a faint glow.

Casting as a ritual requires 1 minute.

At Higher Levels. When you cast this spell using a spell slot of 3nd level or higher, the damage increases by 1d4 fire and 1d4 force damage for each slot level above 2nd.