If it's safe to do so, OL should try to save whatever is left of the Helmet of Nabu after he's done destroying Nabu.
Reasons:
=(1)fragments from a vessel that housed a Lord of Order for centuries could be used in spells, potions, rituals, and area-based wards as a focus or material component: Zatanna, Sephtian, Queen Mera, John Constantine, etc.
=(2)Give a piece to
Eris as a gift or offering, as she is OL's divine patron. I'd
love to have a scene where Eris shows off her new bling to the other Greek goddesses, as half the fun of getting presents is rubbing it in other people's faces.
=(3)Sometimes the pieces of a destroyed magical artifact can be used in creating new enchanted items, and OL is on good terms with Hephaestus and his Amazon disciple
Io.
Examples:
In Marvel's live-action "Avengers" movie, SHIELD salvaged the remains of the Asgardian Destroyer automaton to craft an energy weapon that Agent Coulson used to injure Loki.
In Disney's "Gargoyles",
Xanatos made the android Coyote 4.0 from the melted down remains of the Cauldron of Life, making it resilient to magical attacks and giving it the ability to hold and trap supernatural creatures.
In "the Dresden Files", the Knights of the Cross wield swords with one of nails used in Jesus Christ's crucifixion worked into their hilts.
Link:
Coyote
=(4)For the dryad living in Mount Justice's grove (name???), I know some gardeners and orchard workers will bury old rusted nails and scrap iron to nurture plants that require extra iron oxide in their diet, or to increase soil acidity, or counteract excess salt in the soil, etc.
In MTG terminology, having a grove empowered by
the Green further enhanced by Order magic could promote "dual-color mana": White for order, law, and peace, and Green for life, nature, instinct, and evolution/adaptability.