Nikola Tesla's "death ray" is largely considered a myth, with no credible evidence supporting its existence or functionality. Discussions suggest that while Tesla may have used the term in the press, there was no real design or prototype for such a weapon. The Tesla coil, however, is a legitimate invention based on well-understood principles, and its high-energy output could theoretically be adapted for various applications. Tesla's innovative ideas and showmanship contributed to his legendary status, but modern scrutiny would likely challenge many of his claims. Ultimately, the concept of a death ray remains speculative and unsubstantiated.