Once per turn: You can banish 1 "Lightsworn" monster from your hand or GY, then target 1 of your banished "Lightsworn" monsters, except "Lumina, Twilightsworn Shaman"; Special Summon it. Once per turn, if your other "Lightsworn" monster's effect is activated: Send the top 3 cards of your Deck to the GY.
Revives a Lightsworn monster from the Banish Zone.
Can use monsters in your graveyard as cost.
Weak base stats.
Requires a banish cost.
Can make you deck out quicker.
You can revive the monster you used as cost. Essentially letting you revive a Lightsworn from your graveyard for free. This can be used to get a Wulf, Lightsworn Beast unstuck from your hand. You can only be used if you have at least one banished Lightsworn monster.
The Twilightsworn Lumina might be a little harder to setup than her Lightsworn counterpart but she is better in some ways. Twilightsworn Lumina can use monsters from the graveyard as cost saving you resources. She also lets you revive any level of Lightsworn monster unlike Lightsworn Lumina who only lets you revive low-leveled ones. Twilightsworn is a subset of Lightsworns that let you banish other Lightsworns. Use them to setup monsters for Lumina to revive.
Playing a Twilightsworn deck gives you the option of playing Chaos monsters in your deck. Chaos Dragon Levianeer and Chaos Sorcerer can be summoned by banishing LIGHT and DARK monsters. These monsters can then be revived by Lumina.
Twilightsworn support such as Twilight Cloth and Twilight Eraser have effects that let you banish multiple cards to setup your banish zone.