The X-Genome Code (XGC), or Sign of the Beast, is a shinning mark which appeared on the body of Zoanthropes during the evenements of Bloody Roar 3

Each symbol represents the beast form of the fighters and, since Bloody Roar 3, appears each time a zoanthrope transform himself.

The effect of the XGC mark varies according to the bearer. For most of them, the mark is a prediction of near death. In Bloody Roar 3, Lanfa fell ill of this mark.

We finally discover that the XGC is the result of the liberation of the Tabula of a Thousand Beasts an antic and accursed relic that Xion used for to spread the darkness on the world.