Okay, so lemme level with you guys about Bardic Knowledge.
In AD&D, I played a Bard. I had wanted to be able to do a little bit of magic and a little bit of stabbing, and a fair amount of not getting stabbed myself.
Therefore, the role of Bard sounded great to me. One of my favorite skills was told to me by my friend, the DM at the time, Bardic Knowledge.
By rolling under the appropriate percentile, I would be able to identify nearly anything in the world, as long as I could justify that someone, somewhere, had sang a song about it.
Using examples like Beowulf and the Iliad, I was often able to make a strong case for "knowing about that door in this dungeon."
"Look at the descriptions of Heorot's Great Hall!" I would argue. "They describe every inch of his castle in detail. There's no way that someone didn't sing about this door."
I would use this ability offensively too. One time, the party and I ended up in a room full of statues. Being adventurers, and possessing the usual level of paranoia, I immediately suspected gargoyles. But how to check?
"I Bardic Knowledge the statues."
"What? Why? You can't tell anything about statues from a Bardic Knowledge check!?"
"If they've got a statue, they've got to have a song about them."
All of this made for an immense amount of fun, as I would be able to justify nearly anything due to this knowledge of stories and the world around us.Of course, like all good things, this too had to come to an end.
In this case, it was when I attempted to look up how much Bardic Knowledge went up per level, and couldn't find it in the Player's Handbook. The only thing I could find was an ability that allowed Bards a 35% base chance to recognize a MAGICAL ITEM. My friend had misremembered the ability, and we had just been rolling with it for several campaigns.
Bardic Knowledge evaporated, but while it lasted, it was one of the most amazing and fun abilities.