The Longbow of Diana should still provide reflection when it is in the offhand slot and not actively wielded.

Make the Longbow of Diana able to change shape between the different types of launchers (bow, crossbow, sling), either by invoking it or simply by applying it. This allows Rangers to play with whatever type of ranged combat style they prefer, and allows gnomish Rangers to use a crossbow without being coerced into switching to bow later.

All arrows created by the Longbow of Diana come pre-identified so you can readily see their enchantment.

Invoking the Longbow of Diana gives you light arrows. These are a special object, weightless, created with the same enchantment as the Longbow, but attempting to enchant them further will fail (maybe making the enchanted arrows evaporate). If they leave your inventory for any reason, they will vanish. As a weapon, they are very powerful (to the point of probably instakilling most weaker monsters they hit). To prevent the player stockpiling them, the invoke effect will only top up the amount of them in your inventory to 5.

When a light arrow strikes a target or falls to the ground (and vanishes in the process), it permanently lights up the surrounding area.

The arrows created by the Longbow of Diana are of your race/role’s affiliation (e.g. orcish arrows for orcs, ya for Samurai, etc), and bear the same enchantment as the bow itself.

Invoking the Longbow of Diana gives a temporary buff of “piercing”, in which all your projectiles (not only those fired from the bow) pierce through monsters and continue flying.

Arrows fired from The Longbow of Diana will never break and will automatically return to you. It also counts as your racial bow regardless of your race.

The Longbow of Diana has different effects based on which alignment you are (or perhaps it’s just different artifact bows, only one of which appears). Lawfuls get an Apollonian bow which shoots gold arrows which have higher base damage. Neutrals’ bow fires silver regular arrows. Chaotics’ bow automatically poisons fired arrows.

Make the Ranger quest artifact a crossbow if you are a gnome.