Valmiki Ramayana Yuddha Kanda Sarga 71 Shloka 85
Original Shlokaअतिकायोतितेजस्वीसौरमस्त्रंसमादधे ।।6.71.85।। तेनबाणंभुजङ्गाभंहेमपुङ्खमयोजयत् ।
1 source checked for this shloka
अतितेजस्वी highly energetic, अतिकायः Atikaya, सौरम् अस्त्रम् weapon presided over by Sun god, समाददे fixing, भुजङ्गाभम् similar to serpent, हेमपुङ्खम् with gold feathers, तंबाणम् that arrow, तेन by that, अयोजयत् fixed it.
Highly energetic Atikaya took a serpentlike arrow with gold feathers and charged it by the concentration of his mind on the power of Sun god.