Horwath
Legend
when casting a cantrip that deals damage, you can spend one spell slot.Here's is a question:
Must the simple arcane caster have spell slots?
Because to me, if we're talking about a simple class, then we're going by the idea of being as simple as the fighter champion in fifth edition. So a simple arcane, caster and a simple divine caster would be a class that does not have spell slots..
So if you're talking about a simple arcane caster to teach D&D or be a lower mental load, it has to be a new class..
If you're singing an in simple arcane caster to teach the DND casting system, we're talking about the Sorcerer..
increase damage of the cantrip by 2 dice per spell level of the slot.

