བོད་སྒྲ་
Eight Case: Vocative
No case ending.
The vocative case is indistinguishable from the nominative except contextually unless an interjection such as ཀྱེ་ or ཀྭ་ཡེ་ also appears in the phrase or sentence. These interjections are traditionally called vocative particles.
Oh, gods of gods!
ཀྱེ་ལྷའི་ལྷ།
O Bhagavan, it is amazing!
བཅོམ་ལྡན་འདས་ངོ་མཚར་ལྒས་སོ།