Even the Cranassian Core Fortress includes a Red Crystal, but slightly larger than the others, which is held in a small glass dome. After units that carry Red Crystals get destroyed, the Crystals fly straight out like a space pod fired from a cannon, unharmed, returning to protect the Cranassian Core Fortress. It is possible that the Raiden mk-II and the Raiden mk-II ß both contain miniature Red Crystals (hence they destroyed many of the Cranassian's war units). Red Crystals only appear in the main Raiden series, from the first installment to the current main Raiden installment. In Raiden X, a Red Crystal appears un-armed in the final level bouncing around the screen, in which you can shoot at to gain extra points. The final boss in Raiden DX first appears as a grey metal sphere, then transforms into the boss tank. This suggests that Red Crystals have the ability to reshape metal to any form they desire.
Core Fortress CrystalsEdit
Some Red Crystals are used to power Cranassian Fortresses, such as Horda Gestorada. This fact leads some people to believe that the Cranassians are actually intelligent crystal lifeforms that use their powers to their own advantages.