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First post here
(ttrpg.network)
A place where Game Masters, Dungeon Masters, Storytellers, Narrators, Referees (and etc) can gather and ask questions. Uncertain of where to take the story? Want to spice up your big baddie? Encounters? That player? Ask away!
And if you have questions about becoming a Game Master you are most welcome with those as well!
Rules
If you want to model it after an existing item with mechanics, you could create an undead version of the Orb of Dragonkind from Dragonlance. Here is it's Call Dragons ability:
Source: https://roll20.net/compendium/dnd5e/Orb%20of%20Dragonkind#content
That could be a good inspiration indeed. Thank you