The wave sent against the penultimate line of Alliance defense was composed of the Guardian version 5.2. Not as gracefully proportioned as the later, more popular, version 6.22, they were entirely blue, and blew acid bubbles in a crystalline matrix, producing octahedral guided projectiles. Chaos™ tracking had not been developed yet; the bubbles employed a more primitive, predictable system. The deadly Blazer had been fully perfected by this point, much to the dread of Earthling captains.