This feat takes the choice, permanently out of your hands, for the use of spells and their respective spell slots.
This feat requires you roll the appropriate die (according to available spell slots for your character) when casting spells.
However, the Gods do not like Goblins. Anytime you meet a Goblin race, or face one (or many) in combat, you are required to attack it with your highest available spell slot no matter if it is friend or foe. The idea of 'Overkill' is merely a passing thought rather than a tactical decision. Failure to do so will result in the permanent loss of 1 spell slot determined at random according to the same die rolling description as listed below.
Example: If you have a 6th level spell slot available to your character, irrespective of its availability to use, you would roll a D6 and cast that spell, at the level the die shows. The same would apply if you have a maximum 4th level spell, you would roll a D4. This will follow you until 9th level spell slots become available. When/if that occurs, no matter the spell being cast, you would roll a D10 (rolls of 00 or 10, depending on your die in particular, require a re-roll).
Further example, As a Level 11 Necromancer, you choose to cast Vampiric Touch, instead of using the minimum spell slot required (3rd) you would roll a D6 to determine which spell slot is to be used and calculate damage appropriately. If however, you rolled a 2, you would subtract 1D6 from your damage roll instead of using the listed 3D6 and mark off a 2nd level spell slot.
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