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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
To me, this sounds like a custom 'minor detrimental property', as seen in the DMG's guidance on creating artifact level magic items, page 220.
You don't really need specificity for this, if you look at the regional effects of a vampire for example, it reads "There is a notable increase in the population of bats, rats and wolves in the region". And that's enough of a prompt to cement that usage.
Thank you !