Awakened Horn of Bahamut

This platinum war horn was carved from a horn off of Bahamut’s back after it was slashed off in a battle with the other gods. His champion took it and created it into a large battle horn to command the dragon flights into war against the gods. It has been handed down through generations of dragonborn and half-dragon champions. They say if the horn is blown by Bahamut himself it will call metallic dragons from all across the realms and planes to fight alongside its wielder.
Dormant. The horn of Bahamut grants the following benefits in its dormant state.
You can speak, read, and write Draconic.
As an action you can blow the horn of Bahamut and call to the dragons and draconic warriors of the past. You summon 2d4 dragonborn Berserkers within 60 feet of you that last for 1 minute before they return to the afterlife. Once you use this feature you cannot do so again for a week.
As an action you can cast the spell thunderwave through the horn of Bahamut as a 5th level spell. You can use this feature a number of times equal to your proficiency bonus. You regain these uses after a long rest. The DC for this spell is 15 and cannot be increased or decreased.

Awakened. When the horn of Bahamut reaches an awakened state, it gains the following properties.
You now summon an additional 2d4 Berserkers when using the horn to call on the ancient spirits. Instead of summoning the dragonborn you can summon 2 Young Dragons of any metallic flight which last 1 minute before they return to the afterlife.
As an action you can cast the spell divine word through the horn of Bahamut. Once you use this feature you cannot do so again until you finish a long rest.
You have advantage on any charisma checks against dragons.

Notes: Language: Draconic, The amount of charges equals your proficiency bonus