Re: Help getting black shards from rumor bosses (post edited
Rumor bosses spawn on a random basis based on real time, not in-game time. While the exact rate per each boss is not public, in general 2 or 3 rumor bosses spawn per each hour of game play (often more). Common advice is to work on Town Hall Quests, side quests or hunt for rare drops (i.e. spam a dungeon). Checking in at the inn once an hour or every-half hour will suffice.
Note: If a rumor bosses hasn't spawned, no amount of gossiping at an inn will make it appear. Gossiping gives hints about a rumor boss that's appeared but does not make one appear. Having decent gossip makes it easier to find out about one so it's useful (gossip is improved with traits, skills, equipment, companion etc).