Dragon Companion is a Sorcerer feature gained at level 18 in the 2024 SRD. You can cast Summon Dragon without a Material component.
You can cast Summon Dragon without a Material component. You can also cast it once without a spell slot, and you regain the ability to cast it in this way when you finish a Long Rest.
Whenever you start casting the spell, you can modify it so that it doesn’t require Concentration. If you do so, the spell’s duration becomes 1 minute for that casting.