You summon a Night Drake in an unoccupied space you can see within range.
You can communicate telepathically with this dragon and it can respond telepathically using any language you know. It retains its memories between summoning, on that note, you always summon the same dragon.   The dragon is friendly to you and your companions for the duration. It has its own turns and its own initiative. It obeys any verbal commands that you issue to it (no action required by you).
The dragon disappears when it drops to 0 hit points or the spell ends.   Ascended Spell. This spell costs 2 Spell slots to cast. A 2nd-level spell slot and a 1st-level spell slot.