Nostrum.Api.begin_guild_prune-exclamation-mark

You're seeing just the function begin_guild_prune-exclamation-mark, go back to Nostrum.Api module for more information.
Link to this function

begin_guild_prune!(guild_id, days, reason)

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Specs

begin_guild_prune!(
  Nostrum.Struct.Guild.id(),
  1..30,
  Nostrum.Struct.Guild.AuditLogEntry.reason()
) :: no_return() | %{pruned: integer()}

Same as begin_guild_prune/2, but raises Nostrum.Error.ApiError in case of failure.