Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
ब्रह्माण्डेन कपालेन पिबेत परमामृतम् ।पञ्चवर्गबलाद्युद्धे जयो भवति तच्छृणु ॥ १६ ॥
In the full Agni Purana this is chapter 125, verse 16.
With the skull of the cosmic egg one drinks the highest nectar. By the strength of the five letter groups there is victory in battle. Hear that.
Simple meaning: By the strength of the five letter groups there is victory in battle.
अआकचटतपयाः श आद्यो वर्ग ईरितः ।
The first two letter groups, nine letters each, are named here.
उऊगजडदबलाः सो वर्गश्च तृतीयकः ।
The third and fourth letter groups, nine letters each, are named here.
ओऔअंअः,ङञणना मो वर्गः पञ्चमो भवेत् ।
The fifth letter group is named here. All the groups together have forty-five letters.