The final boss in the dungeon has a move where she shoots her gunblade, either at a player or a Ceruleum tank.
This would imply she's using her weapon, thus the skill name?
But Heirsbane is the name of Gaius' gunblade, which raises questions. (Pg. 185 Encylopedia Eorzea)
Is this an oversight? Intentional and there's an explanation? Colloquialism for shooting a gunblade? Purely referential?