A collection of 30 bardic tales you may hear sung in the local tavern or empresses' court, complete with bardic verse excerpts from all 30 tales themselves.
Many of these tales can also be used as quick plug in adventures for Gm's looking for a side quest. (And let the players exploits be turned into the song by a near by bard perhaps?)
Darklings are a kind of Halflings living in the sewer of medium to large cities.
Even though they smell badly and are quite dirty, Darklings are friendly and clever.
They try to limit the knowledge about their existence to only a small number of trustworthy persons, including player characters.
Darklings trade in information. Money, weapons and magical items have no value for them. This is why they hide beneath the sewer grates, listening to all that is said in the city above.