The Ikaruga Tuna, also known as the "Crimson Grimoire", is a large, tasty fish that can be found in the River Styx. It is featured in Ragna the Bloodedge's gag reel. The Dark War wiped out most species due to the spread of seithr and, as such, tuna is now rare in the world of BlazBlue. This tuna, however, seems to be so good that Rachel and ν-No.13- trade Ragna for it. It also causes the logical Iron Tager to want it, even though he does not eat and he usually would question these actions constantly as he does in his gag reel.