Histone-like protein that is recruited to viral factories during viral replication and participates in viral DNA packaging and virion production probably by forming unstable nucleosome-like particles (PubMed:34297924). May compact the viral DNA (PubMed:34297924). Localize to cytoplasmic viral factories after virus infection (PubMed:34297924). Also present in the nucleus but at much lower concentration (PubMed:34297924). The viral histones that localize in the nucleus apparently do not interact with host genomic DNA and can leave the nucleus to associate with the viral factory (PubMed:34297924). Expression of viral histones begins 2-4 hpi and continues along the infectious cycle. The N-terminus is similar to eukaryotic H2B, whereas the central region is similar to eukaryotic H2A.