Study of captured weapons indicates that they are using designs extrapolated out from future tech. They are not, however, significantly advanced beyond 25th century technology. A likely explanation is that the future benefactor who gave these weapons to the Terran Empire doesn't want to risk putting 29th-century technology into the hands of despotic conquerors who might damage the timeline.
Final outcome: Success
Simple weapon analysis shows that outputs are somewhat higher than those available to contemporary phasers and torpedoes, but only by a small percentage. Reliability is generally higher. This is consistent with technology advanced by approximately 50 years.
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