Chrono String Engines are the source of power for spacecrafts. These engines draw their power from Chrono Strings. Since the probability of gaining energy from any single Chrono String is very low, most engines simply gather large amounts of them in order to be able to extract some energy from a few of them. This is effective enough to provide a continuous and stable power source, but only up to a certain point. There are specialized engines that allowed greater power output through usage of the H.A.L.O. System, which is only equipped on the Emblem Frames. Depending on how well an Angel could handle the H.A.L.O. System, it will have been possible for the engine to output nearly limitless amounts of power. Chrono String engine is the best engine type in Transbaal Empire.