The Eleventh Night Prayer: Two rakāt with Surah al-Fātiḥah once and Surah al-Kawthar (No. 108) twenty times.
The Eleventh Day Supplication
اَللّٰهُمَّ حَبِّبْ اِلَيَّ فِيْهِ الْاِحْسَانَ
allahumma habbib ilayya fihi alihsana
O Allah: on this day, (please) make lovable good-doing for me,
وَ كَرِّهْ اِلَيَّ فِيْهِ الْفُسُوْقَ وَ الْعِصْيَانَ
wa karrih ilayya fihi alfusuqa wal-`isyana
And make abhorrent for me wickedness and disobedience on this day,
وَ حَرِّمْ عَلَيَّ فِيْهِ السَّخَطَ وَ النِّيْرَانَ
wa harrim `alayya fihi s-sakhata wa-nnirana
And prevent me on this day from exposing myself to wrath and the Fire;
بِعَوْنِكَ يَا غِيَاثَ الْمُسْتَغِيْثِيْنَ
bi`awnika ya ghiyatha almustaghithina