taru-adjective, adverb taking the 'to' particle
Rare literary term describing dazzling brightness or brilliance, often used in classical or poetic descriptions. Functions as a taru-adjective or adverb with と.
爛として輝く星々。
Stars shining brilliantly.
その宝石は爛たる光を放っていた。
The jewel emitted a brilliant light.