That's why I said "indirectly". You need the broken blade of legends, but you turn it into excalibro in the raid area of the Spire.
You get the "Enhanced Old Bow" from Seldanna when you repair Mirel's "Old Bow" and she is a druid. If Mirel is a Sniper, she gets the "Repaired Old Bow" instead. This way the bow you get will always fit to the class and the role she has in the party.