Other writers worthy of mention are Mahabala Kavi, the author of "Neminathapurana" (1254), an account of the 22nd Jain tirthankar Neminatha, and Kumudendu, author of a Jain version of the epic Ramayana in "shatpadi" metre called "Kumudendu Ramayana" in 1275. The effort was influenced by "Pampa Ramayana" of Nagachandra. Kumara Padmarasa, son of Kereya Padmarasa, wrote the "Sananda Charitre" in "shatpadi" metre. Ratta Kavi, a Jain noble, wrote a quasi-scientific piece called "Rattasutra" (or "Rattamala") in 1300. The writing bears on natural phenomena such rain, earthquakes, lightning, planets and omens. A commentary on the "Amara Khosa", considered useful to students of the language, called "Amara Khosa Vyakhyana" was written by the Jain writer Nachiraja (1300). Towards the end of the Hoysala rule, Nagaraja wrote "Punyasrava" in 1331 in "champu" style, a work that narrates the stories of puranic heroes in 52 tales and is said to be a translation from Sanskrit.