Pronunciation: [mˈɔːtɐlsˌɪn] (IPA)
Correct spelling for the English word "mortalsin" is [mˈɔːtɐlsˌɪn], [mˈɔːtɐlsˌɪn], [m_ˈɔː_t_ɐ_l_s_ˌɪ_n] (IPA phonetic alphabet).