Chrono String Engines are spacecrafts' sources of power. 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 allow greater power output through usage of the H.A.L.O. System, which is only equipped on certain Emblem Frames. Depending on how well an Angel can handle the H.A.L.O. System, it will have been possible for the engine to output nearly limitless amounts of power.