(from Buddha Heruka)
is a term given by a channeler years ago because he could relate to that term.
“Akasha” refers to a king who lived many aeons ago. This channeler had a special connection to that King, so the channeler understood what he was accessing to be like a library or collection of all that King’s realizations.
That king actually became, when he attained Enlightenment, Buddha Akshobya, who is the head of one of the five Buddha families.