<p>I recomend you 3 options:</p><ul><li>Ancient Ruins Tomb: you have around 20 banshee there but they are bit far from each other</li><li>Banshee Quest at Ghostland: you have a good number and at Banshee Queen room you have aroun 6 of them</li><li><a rel="nofollow" href="https://tibia.fandom.com/wiki/Spirit_Grounds">Spirit Grounds</a>: That is the best place in my opinion, specially because you have 4 different monsters there (<a rel="nofollow" href="https://tibia.fandom.com/wiki/Nightstalker" title="Nightstalker">Nightstalkers</a>, <a rel="nofollow" href="https://tibia.fandom.com/wiki/Banshee" title="Banshee">Banshees</a>, <a rel="nofollow" href="https://tibia.fandom.com/wiki/Souleater" title="Souleater">Souleaters</a> and <a rel="nofollow" href="https://tibia.fandom.com/wiki/Braindeath" title="Braindeath">Braindeaths</a>). The dbad href="https://tibia.fandom.com/wiki/Nightstalker">Nightstalkers</a>, <a rel="nofollow" href="https://tibia.fandom.com/wiki/Banshee">Banshees</a>, <a rel="nofollow" href="https://tibia.fandom.com/wiki/Souleater">Souleaters</a> and <a rel="nofollow" href="https://tibia.fandom.com/wiki/Braindeath">Braindeaths</a>). The bad thing is that it is not always these creatures that are available on Spirit Grounds.</li></ul>