Below is the only known reference to the Law of Dissolution in the writings of Alice A. Bailey (AAB) and Djwhal Khul (DK). Links on these pages of the Laws of Alice A. Bailey are to the online books at the Lucis Trust website.
For a discussion of what AAB means by a “law” please see Alice A. Bailey – What is a Law?
… the seeds of death and of disease are not so potent; sensitivity to inner soul realisation grows until the time is reached when the initiate-disciple dies by an act of his spiritual will or in response to group karma or to national or planetary karma. Disease and death are essentially conditions inherent in substance; just as long as a man identifies himself with the form aspect, so will he be conditioned by the Law of Dissolution. This law is a fundamental and natural law governing the life of the form in all the kingdoms of nature.
A quote on “dissolution”:
“As evolution proceeds in the fifth or spiritual kingdom, these three fires blaze forth simultaneously, producing perfected consciousness. This blaze results in the final purification of matter and its consequent adequacy; at the close of manifestation it brings about eventually the destruction of the form and its dissolution, and the termination of existence as understood on the lower planes. In terms of Buddhistic theology it produces annihilation; this involves, not loss of identity, but the cessation of objectivity and the escape of Spirit, plus mind, to its cosmic centre.” -A Treatise on Cosmic Fire
From the Theosophy Wiki:
The larger cycles affect the whole universe, which undergoes a recurring process of creation and dissolution that in Hindu thought are called manvantara and pralaya:
As the sun arises every morning on our objective horizon out of its (to us) subjective and antipodal space, so does the Universe emerge periodically on the plane of objectivity, issuing from that of subjectivity—the antipodes of the former. This is the “Cycle of Life.” And as the sun disappears from our horizon, so does the Universe disappear at regular periods, when the “Universal night” sets in. The Hindoos call such alternations the “Days and Nights of Brahma,” or the time of Manvantara and that of Pralaya (dissolution). The Westerns may call them Universal Days and Nights if they prefer. -Law of Cycles