Venetica

You get this quest from San at the occult shop in the inner city. She asks you to rid the rooftops of the roof beasts and destroy their nests so she can collect white ivy again. There are only 3 this time. The quest will mark the green dots on your map to denote the nests, but you can see the beasts flying in circles from anywhere on the rooftops. The first and easiest to get to is above the tavern. Once you've cleared out all three nests, go back to San for your reward and 300 XP.

Note: It is safer to get the quest from San before destroying the nests to make sure you get credit toward the 50 quests needed for the Quest Master achievement.