Build RIFTMARK CITADEL on flat terr...

Build RIFTMARK CITADEL on flat terrain as a realistic player-scale medieval fortress like the reference image. Use stone bricks, deepslate tiles, polished deepslate, dark oak roofs/beams, lanterns, chains, iron bars, and black/red/white wool for banners. Add outer defensive walls with 4 corner towers and a large front gatehouse. Leave open courtyard space inside for a small market, paths, trees, and a well. In the center, build a detailed keep with 4 taller towers, steep dark roofs, arches, battlements, balconies, chimneys, and narrow windows. Put a large black banner with red border, white crown, and big white R on the FRONT of the keep. Keep it clean, sharp, and detailed up close.