The description of the Artificer Initiate feat states, in part (TCoE, p. 79):
You’ve learned some of an artificer’s inventiveness:
- You learn one cantrip of your choice from the artificer spell list, and you learn one 1st-level spell of your choice from that list. Intelligence is your spellcasting ability for these spells.
- You can cast this feat's 1st-level spell without a spell slot, and you must finish a long rest before you can cast it in this way again. You can also cast the spell using any spell slots you have.
Can a wizard with the Artificer Initiate feat upcast a Cure Wounds spell that they learn using the feat?
So, in my last session, one player casts a Cure Wounds using a 5th-level spell slot, and he expected to cure 5d8+5 hit points. My understanding is that he can use a high-level spell slot, but the spell is always cast in level 1 (like the shield spell) since he is an artificer initiate. Am I wrong, by RAW?