Splinter A is the section of existence affected and copied by .Entropy. It is not affected by Voidweb.
Splinter A is the section of the universe that made up existence before .Entropy. This is where Elysia and the Infinitium were attacked and destroyed on May 15th. The Arkn and Dekn reside in this section, as does the Red Nova and the rest of .Reality and Nexia.