Lavra Plain is a free Art Nouveau Cyrillic caps font with tall, theatrical letters and a distinctly ornamental rhythm. The caps mix severe vertical blocks with curling leaf-like forms tucked inside the strokes, so the font feels part poster lettering, part monogram, with a slightly ecclesiastical air.
It fits best where the lettering can act like decoration - book covers, cultural posters, title cards, logo marks, and chapter openings all suit this free font. The long uprights and enclosed flourishes give short names, cover lines, and monograms enough movement to carry a page without needing much else around them.