Valmiki Ramayana Yuddha Kanda Sarga 93 Shloka 20

पुत्रवधसन्तप्तः pondering over the death of son, शूरः asura, सःरावणः that Ravana, क्रोधवशम् overtaken by fury, गतःwent, बुद्ध्या thinking in mind, समीक्ष्य reviewed, वैदेह्याःVaidehi's, वधम् destruction, रोचयत् thought

Pondering over the death of his asura son, Ravana was overtaken by fury, and reviwed thinking about the destruction of Vaidehi.