X-Men: Phoenix - Legacy of Fire #1

In one alternate reality, the Phoenix Force is not just an entity, but a weapon. The Phoenix Sword as it is called is guarded and wielded by the sorceress, Madelyne Pyre, who inherited the sword from her mother. As Madelyne's time as wielder of the sword is nearly up, she trains little sister Jena in the arts of fighting and magic so she can shoulder the responsibility of carrying such great power.