Samadhi means super-conscious state, wherein the yogi gets super-sensual experiences. Samadhi is of two kinds viz., sarhprajnata or sabīja or savikalpa, and asamprajnata or nirbīja or nirvikalpa. In savikalpa samadhi, there are triputi (triad) – the knower, knowledge and knowable. There is ālaṁbana (support) for the mind to lean upon. The samskāras (tendencies) are not fried. In nirvikalpa, there is neither triputi nor ālaṁbana. The samskāras are fried in toto. The nirvikalpa samādhi only can destroy birth and death, and bring in highest knowledge and bliss. Savikalpa samādhi is of various kinds – savitarka and nirvitarka, savicāra and nirvicāra, sa-ānanda, and asmita.
When you get full success or perfection (siddhi) in raja yoga by entering into asamprajnāta samādhi (nirvikalpa state) all the samskāras and
vāsanās (conditioning) which bring on rebirths are totally fried up. All vrttis (mental modifications) that arise from the mind-lake come under restraint. The five afflictions, viz., avidyā (ignorance), asmitā (egoism), rāga-dvesa (love and hatred), and abhiniveśa (clinging to life) are destroyed and the bonds of karma are annihilated. Control the mind and the sense, become desireless, develop the power of endurance, contemplate, see the self in the self. Samadhi brings on highest good (niśreyas) and exaltation (abhyudaya). It gives mokṣa (deliverance from the wheel of births and deaths). The afflictions, egoism, etc., have their root in avidyā (ignorance). With the advent of the knowledge of the self, the ignorance vanishes. With the disappearance of the root cause, viz., ignorance, egoism, etc., also disappear.
In the asamprajnāta samadhi, all the modifications of the mind are completely restrained. All the residual samskāras also are totally burnt. This is the highest samādhi of rāja yoga. This is also known as nirbija samādhi (without seeds) and nirvikalpa samādhi.
Dharma megha in raja yoga means “the cloud of virtue.” Just as clouds shower rain, so also this dharma-megha samadhi showers on the yogis omniscience and all sorts of siddhis (powers). Karma is the seed for life state, life period and life experience. Nirbija samadhi will burn all the seeds.