This ability may not be a necessity, but it is fun to have if you seek to deal damage with a specific weapon, or eliminate one that is a threat to you (these weapons do break when Drachma uses them).
Episka the Phoenix-Gryphon on the other hand has her moveset almost entirely centred around weapons as a counterpart for Drachmas elemental powers. So she can use weapons as much as she wants without wearing them down (unless she tries to block or parry heavy attacks), but there's plenty of weapons enemies carry that she can swap between on the fly.

Drachma Brimston and Episka belong to me.