Campaign: Dungeons of Drakkenheim

A character may only attune to the Crown of Westemär by performing a special one hour ceremony with six other characters who are each attuned to a different Seal of Drakkenheim. See below for details on this ritual.
  The crown has 3 charges. While wearing it, you can use an action to expend 1 charge to cast the Wish spell from it. The crown regains one expended charge every ten years.
  The ancient bronze dragon Minazorond, the tower dragons, and the wall gargoyles are under your control and obey your spoken commands while you wear the crown.
  While wearing the crown and seated on the Throne of Drakkenheim in Castle Drakken, you may use an action to communicate telepathically with one dragon or twelve gargoyles so long as they are within 100 miles of Castle Drakken. When you do, you can  issue commands to those creatures, see through one of the creature’s eyes, and hear what it hears until the start of your next turn, gaining the benefits of any special senses that the creature has. During this time, you are deaf and blind with regard to your own senses.

Coronation Ceremony
This special ceremony takes an hour to perform and requires seven participants. During this time, one participant (the “heir”) must sit upon the Throne of Drakkenheim wearing the Crown of Westemär. The other six participants must each be attuned to a different Seal of Drakkenheim. The ritual fails immediately if any participant becomes incapacitated, moves more than thirty feet away from the throne, or if the heir does not remain seated on the throne for the duration. One after the other, each participant attuned to a Seal must approach the
throne, pledge their allegiance, and offer their lifelong service to the new monarch. Each then makes a DC 20 ability check using an ability score that corresponds to their Seal of Drakkenheim:

• Lord Commander’s Badge (Strength)
• Spymaster’s Signet (Dexterity)
• Steward’s Seal (Constitution)
• Inscrutable Staff (Intelligence)
• Saint Vitruvio’s Phylactery (Wisdom)
• Chancellor’s Crest (Charisma)

The designated heir responds to each ability check by making an appropriate check of their own using the same ability score. While all 12 checks must be attempted to finish the ceremony, only 8 successful check results are needed to successfully complete  it and attune the heir to the crown. Encourage each character 

participating in the ritual to roleplay out their vow, and the response of the monarch to each. Since the throne is contaminated, each failed ability check causes the designated heir to immediately take 14 (4d6) psychic damage. In addition, they must succeed on a DC 20 Constitution saving throw or take an additional 10 (3d6) necrotic damage and gain one level of contamination. Failure by 5 or more causes the heir to take 35 (10d6) damage and gain 1d4 levels of contamination instead. Remember, a creature can’t regain hit points while seated on the throne! If the heir is transformed into a monster or reduced to 0 hit points, they immediately transform into another Amalgamation.

NOTE: Not every Seal needs to be worn by a player character: the characters might choose one or more faction leaders or other key non-player characters to wear the Seals. In such cases, these NPCs should offer their hopes for the future, express their gratitude to the player characters, and celebrate their accomplishments. You might even allow the players to make dice rolls for them.

At the outset of the Dungeons of Drakkenheim campaign, the Crown of Westemär is located in the throne room of Castle Drakken.

Notes: special one hour ceremony with six other characters who are each attuned to a different Seal of Drakkenheim