Kyerim, the generation stage, and dzogrim, the completion stage, together form the fundamental two stage structure of deity practice, sadhana, in the highest classes of Buddhist tantra, a division the whole of Vajrayana deity meditation is organised around regardless of which specific deity or tantric cycle a particular practice belongs to. In the generation stage the practitioner systematically visualises and constructs a deity's complete form together with its mandala palace and surrounding retinue in vivid mental detail, a deliberate, effortful act of visualisation the tradition frames as training pure perception, learning to perceive the practitioner's own body, speech and mind as inseparable from the deity's enlightened qualities rather than as an exercise in fantasy or artistic imagination for its own sake.
The completion stage that follows works differently, generally involving the deliberate dissolution of the visualised form back into emptiness and, depending on the specific tantric system, subtle body practices working directly with the channels, winds and drops of the body's energetic system understood in tantric physiology, moving the practitioner from constructed visualisation toward the direct, non conceptual realisation the generation stage is understood to prepare the ground for.