Delayed Explosion

You touch an object (Of a size no larger than 10cm) and imbue it with explosive properties.
While you are maintaining concentration, the object will not explode. As soon as you stop (or you decide to explode it), the object will explode, causing force damage of 2d12 Force damage.
If the object doesn't explode in 20 minutes, it's properties are lost. For every spell slot over 1, the time goes up by 20 minutes.
As a bonus action, you can throw the object (if you had it in your hands) to an objective, his saving throw will be the normal amount -2

At higher levels, the damage will increase by 1d6.

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