Two in inseparable unity of buddhahood. Or union of wisdom (emptiness) and spontaneous present skilful means by compassion.
Rupakaya seen from sutra; by ( take about tree kalpas is me said) practices like perfection morality, generosity, meditation, patience..
Rupakaya Dzogchen by rainbow body of light. That can manifest as Nirmanakaya to help.
Dharmakaya and Rupakaya are not separated in Bodhi, not separate in so called Absolute Bodhichitta.
“Sentient beings, self and others, enemies and dear ones—all are made by thoughts. It is like seeing a rope and mistaking it for a snake. When we think that the rope is a snake, we are scared, but once we see that we are looking at a rope, our fear dissipates. We have been deluded by our thoughts. Likewise, mentally fabricating self and others, we generate attachment and aversion.” ~Dilgo Khyentse Rinpoche